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| author |   Daniel Vetter <daniel.vetter@ffwll.ch> | 2017-07-26 13:23:10 +0200 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2017-07-26 13:43:33 +0200 |
| commit | af055598542670c8533a58582813b1419949cae0 (patch) | |
| tree | 901fa1bf635d5c1e91d08f9f4c2e4943516dbb71 /Documentation/robust-futexes.txt | |
| parent | drm/syncobj: Fix kerneldoc (diff) | |
| parent | Merge tag 'drm-intel-next-2017-07-17' of git://anongit.freedesktop.org/git/drm-intel into drm-next (diff) | |
| download | linux-dev-af055598542670c8533a58582813b1419949cae0.tar.xz linux-dev-af055598542670c8533a58582813b1419949cae0.zip | |
Merge airlied/drm-next into drm-misc-next
I need this to be able to apply the deferred fbdev setup patches, I
need the relevant prep work that landed through the drm-intel tree.
Also squash in conflict fixup from Laurent Pinchart.
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'Documentation/robust-futexes.txt')
| -rw-r--r-- | Documentation/robust-futexes.txt | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/Documentation/robust-futexes.txt b/Documentation/robust-futexes.txt index 61c22d608759..6c42c75103eb 100644 --- a/Documentation/robust-futexes.txt +++ b/Documentation/robust-futexes.txt @@ -1,4 +1,8 @@ -Started by: Ingo Molnar <mingo@redhat.com> +======================================== +A description of what robust futexes are +======================================== + +:Started by: Ingo Molnar <mingo@redhat.com> Background ---------- @@ -163,7 +167,7 @@ Implementation details ---------------------- The patch adds two new syscalls: one to register the userspace list, and -one to query the registered list pointer: +one to query the registered list pointer:: asmlinkage long sys_set_robust_list(struct robust_list_head __user *head, @@ -185,7 +189,7 @@ straightforward. The kernel doesn't have any internal distinction between robust and normal futexes. If a futex is found to be held at exit time, the kernel sets the -following bit of the futex word: +following bit of the futex word:: #define FUTEX_OWNER_DIED 0x40000000 @@ -193,7 +197,7 @@ and wakes up the next futex waiter (if any). User-space does the rest of the cleanup. Otherwise, robust futexes are acquired by glibc by putting the TID into -the futex field atomically. Waiters set the FUTEX_WAITERS bit: +the futex field atomically. Waiters set the FUTEX_WAITERS bit:: #define FUTEX_WAITERS 0x80000000 |