The patch titled
Subject: kprobes: remove duplicated strong free_insn_page in x86 and s390
has been added to the -mm tree. Its filename is
kprobes-remove-duplicated-strong-free_insn_page-in-x86-and-s390.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/kprobes-remove-duplicated-strong-free_insn_page-in-x86-and-s390.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/kprobes-remove-duplicated-strong-free_insn_page-in-x86-and-s390.patch
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------------------------------------------------------
From: Barry Song <song.bao.hua@xxxxxxxxxxxxx>
Subject: 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@xxxxxxxxxxxxx
Signed-off-by: Barry Song <song.bao.hua@xxxxxxxxxxxxx>
Acked-by: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
Acked-by: Heiko Carstens <hca@xxxxxxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Vasily Gorbik <gor@xxxxxxxxxxxxx>
Cc: Christian Borntraeger <borntraeger@xxxxxxxxxx>
Cc: "Naveen N. Rao" <naveen.n.rao@xxxxxxxxxxxxx>
Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@xxxxxxxxx>
Cc: David S. Miller <davem@xxxxxxxxxxxxx>
Cc: Qi Liu <liuqi115@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/s390/kernel/kprobes.c | 5 -----
arch/x86/kernel/kprobes/core.c | 6 ------
include/linux/kprobes.h | 1 -
kernel/kprobes.c | 2 +-
4 files changed, 1 insertion(+), 13 deletions(-)
--- a/arch/s390/kernel/kprobes.c~kprobes-remove-duplicated-strong-free_insn_page-in-x86-and-s390
+++ a/arch/s390/kernel/kprobes.c
@@ -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)
--- a/arch/x86/kernel/kprobes/core.c~kprobes-remove-duplicated-strong-free_insn_page-in-x86-and-s390
+++ a/arch/x86/kernel/kprobes/core.c
@@ -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)
--- a/include/linux/kprobes.h~kprobes-remove-duplicated-strong-free_insn_page-in-x86-and-s390
+++ a/include/linux/kprobes.h
@@ -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);
--- a/kernel/kprobes.c~kprobes-remove-duplicated-strong-free_insn_page-in-x86-and-s390
+++ a/kernel/kprobes.c
@@ -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);
}
_
Patches currently in -mm which might be from song.bao.hua@xxxxxxxxxxxxx are
kprobes-remove-duplicated-strong-free_insn_page-in-x86-and-s390.patch
