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kprobes: remove duplicated strong free_insn_page in x86 and s390 

free_insn_page() in x86 and s390 is same with the common weak function in
kernel/kprobes.c.  Plus, the comment "Recover page to RW mode before
releasing it" in x86 seems insensible to be there since resetting mapping
is done by common code in vfree() of module_memfree().  So drop these two
duplicated strong functions and related comment, then mark the common one
in kernel/kprobes.c strong.

Link: https://lkml.kernel.org/r/20210608065736.32656-1-song.bao.hua@hisilicon.com
Signed-off-by: Barry Song <song.bao.hua@hisilicon.com>
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: "Naveen N. Rao" <naveen.n.rao@linux.ibm.com>
Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Qi Liu <liuqi115@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Barry Song 2021-06-30 18:56:31 -07:00 committed by Linus Torvalds
parent 86d1919a4f
commit 66ce75144d
4 changed files with 1 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
arch/s390/kernel/kprobes.c
View File

@ -44,11 +44,6 @@ void *alloc_insn_page(void)
return page;
}
void free_insn_page(void *page)
{
module_memfree(page);
}
static void *alloc_s390_insn_page(void)
{
if (xchg(&insn_page_in_use, 1) == 1)

6
arch/x86/kernel/kprobes/core.c
View File

@ -422,12 +422,6 @@ void *alloc_insn_page(void)
return page;
}
/* Recover page to RW mode before releasing it */
void free_insn_page(void *page)
{
module_memfree(page);
}
/* Kprobe x86 instruction emulation - only regs->ip or IF flag modifiers */
static void kprobe_emulate_ifmodifiers(struct kprobe *p, struct pt_regs *regs)

1
include/linux/kprobes.h
View File

@ -407,7 +407,6 @@ int enable_kprobe(struct kprobe *kp);
void dump_kprobe(struct kprobe *kp);
void *alloc_insn_page(void);
void free_insn_page(void *page);
int kprobe_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
char *sym);

2
kernel/kprobes.c
View File

@ -106,7 +106,7 @@ void __weak *alloc_insn_page(void)
return module_alloc(PAGE_SIZE);
}
void __weak free_insn_page(void *page)
static void free_insn_page(void *page)
{
module_memfree(page);
}