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86e50ab6f8
Mark get_current() and current_thread_info() functions as always_inline to
fix the following modpost warning:
WARNING: modpost: vmlinux: section mismatch in reference: get_current+0xc (section: .text.unlikely) -> initcall_level_names (section: .init.data)
The warning happens when these functions are called from an __init
function and they don't get inlined (remain in the .text section) while
the value they return points into .init.data section. Assuming
get_current() always returns a valid address, this situation can happen
only during init stage and accessing .init.data from .text section during
that stage should pose no issues.
Link: https://lkml.kernel.org/r/20240704132506.1011978-2-surenb@google.com
Fixes: 22d407b164 ("lib: add allocation tagging support for memory allocation profiling")
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Cc: Kent Overstreet <kent.overstreet@linux.dev>
Cc: Chris Zankel <chris@zankel.net>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Juri Lelli <juri.lelli@redhat.com>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vincent Guittot <vincent.guittot@linaro.org>
Cc: kernel test robot <lkp@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
146 lines
4.1 KiB
C
146 lines
4.1 KiB
C
/*
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* include/asm-xtensa/thread_info.h
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2001 - 2005 Tensilica Inc.
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*/
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#ifndef _XTENSA_THREAD_INFO_H
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#define _XTENSA_THREAD_INFO_H
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#include <linux/stringify.h>
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#include <asm/kmem_layout.h>
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#define CURRENT_SHIFT KERNEL_STACK_SHIFT
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#ifndef __ASSEMBLY__
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# include <asm/processor.h>
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#endif
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/*
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* low level task data that entry.S needs immediate access to
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* - this struct should fit entirely inside of one cache line
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* - this struct shares the supervisor stack pages
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* - if the contents of this structure are changed, the assembly constants
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* must also be changed
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*/
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#ifndef __ASSEMBLY__
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#if XTENSA_HAVE_COPROCESSORS
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typedef struct xtregs_coprocessor {
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xtregs_cp0_t cp0;
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xtregs_cp1_t cp1;
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xtregs_cp2_t cp2;
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xtregs_cp3_t cp3;
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xtregs_cp4_t cp4;
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xtregs_cp5_t cp5;
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xtregs_cp6_t cp6;
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xtregs_cp7_t cp7;
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} xtregs_coprocessor_t;
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#endif
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struct thread_info {
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struct task_struct *task; /* main task structure */
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unsigned long flags; /* low level flags */
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unsigned long status; /* thread-synchronous flags */
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__u32 cpu; /* current CPU */
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__s32 preempt_count; /* 0 => preemptable,< 0 => BUG*/
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#if XCHAL_HAVE_EXCLUSIVE
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/* result of the most recent exclusive store */
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unsigned long atomctl8;
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#endif
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#ifdef CONFIG_USER_ABI_CALL0_PROBE
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/* Address where PS.WOE was enabled by the ABI probing code */
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unsigned long ps_woe_fix_addr;
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#endif
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/*
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* If i-th bit is set then coprocessor state is loaded into the
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* coprocessor i on CPU cp_owner_cpu.
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*/
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unsigned long cpenable;
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u32 cp_owner_cpu;
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/* Allocate storage for extra user states and coprocessor states. */
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#if XTENSA_HAVE_COPROCESSORS
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xtregs_coprocessor_t xtregs_cp;
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#endif
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xtregs_user_t xtregs_user;
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};
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#endif
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/*
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* macros/functions for gaining access to the thread information structure
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*/
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#ifndef __ASSEMBLY__
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#define INIT_THREAD_INFO(tsk) \
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{ \
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.task = &tsk, \
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.flags = 0, \
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.cpu = 0, \
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.preempt_count = INIT_PREEMPT_COUNT, \
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}
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/* how to get the thread information struct from C */
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static __always_inline struct thread_info *current_thread_info(void)
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{
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struct thread_info *ti;
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__asm__("extui %0, a1, 0, "__stringify(CURRENT_SHIFT)"\n\t"
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"xor %0, a1, %0" : "=&r" (ti) : );
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return ti;
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}
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#else /* !__ASSEMBLY__ */
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/* how to get the thread information struct from ASM */
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#define GET_THREAD_INFO(reg,sp) \
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extui reg, sp, 0, CURRENT_SHIFT; \
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xor reg, sp, reg
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#endif
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/*
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* thread information flags
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* - these are process state flags that various assembly files may need to access
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*/
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#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
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#define TIF_SIGPENDING 1 /* signal pending */
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#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
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#define TIF_SINGLESTEP 3 /* restore singlestep on return to user mode */
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#define TIF_SYSCALL_TRACEPOINT 4 /* syscall tracepoint instrumentation */
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#define TIF_NOTIFY_SIGNAL 5 /* signal notifications exist */
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#define TIF_RESTORE_SIGMASK 6 /* restore signal mask in do_signal() */
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#define TIF_NOTIFY_RESUME 7 /* callback before returning to user */
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#define TIF_DB_DISABLED 8 /* debug trap disabled for syscall */
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#define TIF_SYSCALL_AUDIT 9 /* syscall auditing active */
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#define TIF_SECCOMP 10 /* secure computing */
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#define TIF_MEMDIE 11 /* is terminating due to OOM killer */
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#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
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#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
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#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
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#define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
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#define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
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#define _TIF_NOTIFY_SIGNAL (1<<TIF_NOTIFY_SIGNAL)
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#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
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#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
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#define _TIF_SECCOMP (1<<TIF_SECCOMP)
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#define _TIF_WORK_MASK (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \
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_TIF_SYSCALL_TRACEPOINT | \
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_TIF_SYSCALL_AUDIT | _TIF_SECCOMP)
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#define THREAD_SIZE KERNEL_STACK_SIZE
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#define THREAD_SIZE_ORDER (KERNEL_STACK_SHIFT - PAGE_SHIFT)
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#endif /* _XTENSA_THREAD_INFO */
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