+ kprobes-remove-duplicated-strong-free_insn_page-in-x86-and-s390.patch added to -mm tree

+ kprobes-remove-duplicated-strong-free_insn_page-in-x86-and-s390.patch added to -mm tree

[akpm]

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@hisilicon.com>
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@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>
---

 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@hisilicon.com are

kprobes-remove-duplicated-strong-free_insn_page-in-x86-and-s390.patch