linux-kernel - [RFC v2 PATCH 1/2] uprobes: make vma_has

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Date:   Tue, 19 Jun 2018 07:34:15 +0800
From:   Yang Shi <yang.shi@...ux.alibaba.com>
To:     mhocko@...nel.org, willy@...radead.org, ldufour@...ux.vnet.ibm.com,
        akpm@...ux-foundation.org, peterz@...radead.org, mingo@...hat.com,
        acme@...nel.org, alexander.shishkin@...ux.intel.com,
        jolsa@...hat.com, namhyung@...nel.org
Cc:     yang.shi@...ux.alibaba.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: [RFC v2 PATCH 1/2] uprobes: make vma_has_uprobes non-static

vma_has_uprobes() will be used in the following patch to check if a vma
could be unmapped with holding read mmap_sem, but it is static. So, make
it non-static to use outside uprobe.

Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Signed-off-by: Yang Shi <yang.shi@...ux.alibaba.com>
---
 include/linux/uprobes.h | 7 +++++++
 kernel/events/uprobes.c | 2 +-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/include/linux/uprobes.h b/include/linux/uprobes.h
index 0a294e9..7f1fb8c 100644
--- a/include/linux/uprobes.h
+++ b/include/linux/uprobes.h
@@ -149,6 +149,8 @@ struct uprobes_state {
 extern bool arch_uprobe_ignore(struct arch_uprobe *aup, struct pt_regs *regs);
 extern void arch_uprobe_copy_ixol(struct page *page, unsigned long vaddr,
 					 void *src, unsigned long len);
+extern bool vma_has_uprobes(struct vm_area_struct *vma, unsigned long start,
+			    unsigned long end);
 #else /* !CONFIG_UPROBES */
 struct uprobes_state {
 };
@@ -203,5 +205,10 @@ static inline void uprobe_copy_process(struct task_struct *t, unsigned long flag
 static inline void uprobe_clear_state(struct mm_struct *mm)
 {
 }
+static inline bool vma_has_uprobes(struct vm_area_struct *vma, unsigned long,
+				   unsigned long end)
+{
+	return false;
+}
 #endif /* !CONFIG_UPROBES */
 #endif	/* _LINUX_UPROBES_H */
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index 1725b90..bd46b7a 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -1095,7 +1095,7 @@ int uprobe_mmap(struct vm_area_struct *vma)
 	return 0;
 }
 
-static bool
+bool
 vma_has_uprobes(struct vm_area_struct *vma, unsigned long start, unsigned long end)
 {
 	loff_t min, max;
-- 
1.8.3.1