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Subject[PATCH 06/16] perf, persistent: Return -EACCES if mapped buffers must be readonly
Date
From: Robert Richter <robert.richter@calxeda.com>

mmap should return EACCES error if fd can not be opened writable.
This error code also helps userland to map buffers readonly on
failure.

Signed-off-by: Robert Richter <robert.richter@calxeda.com>
---
kernel/events/core.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/events/core.c b/kernel/events/core.c
index 0730f36..a9b6470 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -3761,7 +3761,7 @@ static int perf_mmap(struct file *file, struct vm_area_struct *vma)
return -EINVAL;

if (event->attr.persistent && (vma->vm_flags & VM_WRITE))
- return -EINVAL;
+ return -EACCES;

vma_size = vma->vm_end - vma->vm_start;
nr_pages = (vma_size / PAGE_SIZE) - 1;
--
1.8.1.1


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