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| author | Jann Horn <jannh@google.com> | 2020-03-02 14:29:39 +0300 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2020-03-21 19:48:13 +0300 |
| commit | 9c40365a65d62d7c06a95fb331b3442cb02d2fd9 (patch) | |
| tree | 29cc1286beea148e2930e75775b9a71ba8e85ad7 /include/linux/threads.h | |
| parent | 6c8116c914b65be5e4d6f66d69c8142eb0648c22 (diff) | |
| download | linux-9c40365a65d62d7c06a95fb331b3442cb02d2fd9.tar.xz | |
threads: Update PID limit comment according to futex UAPI change
The futex UAPI changed back in commit 76b81e2b0e22 ("[PATCH] lightweight
robust futexes updates 2"), which landed in v2.6.17: FUTEX_TID_MASK is now
0x3fffffff instead of 0x1fffffff. Update the corresponding comment in
include/linux/threads.h.
Documentation mentions that only the lower 29 bits are available for TID
storage, but as the UAPI header released the bit already via
FUTEX_TID_MASK, this is moot as well. Fix it up.
[ tglx: Fixed up documentation ]
Signed-off-by: Jann Horn <jannh@google.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20200302112939.8068-1-jannh@google.com
Diffstat (limited to 'include/linux/threads.h')
| -rw-r--r-- | include/linux/threads.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/threads.h b/include/linux/threads.h index 3086dba525e2..18d5a74bcc3d 100644 --- a/include/linux/threads.h +++ b/include/linux/threads.h @@ -29,7 +29,7 @@ /* * A maximum of 4 million PIDs should be enough for a while. - * [NOTE: PID/TIDs are limited to 2^29 ~= 500+ million, see futex.h.] + * [NOTE: PID/TIDs are limited to 2^30 ~= 1 billion, see FUTEX_TID_MASK.] */ #define PID_MAX_LIMIT (CONFIG_BASE_SMALL ? PAGE_SIZE * 8 : \ (sizeof(long) > 4 ? 4 * 1024 * 1024 : PID_MAX_DEFAULT)) |