From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 1791) id DEAB93858D3C; Tue, 4 Oct 2022 12:55:27 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org DEAB93858D3C DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1664888127; bh=qm+YXv01GwEn/8wGzwZIWD4Mbwv/S7X27eAmpJ0Tuqk=; h=From:To:Subject:Date:From; b=daibZAcnSsCUNI1+zZuZbYe3KhJq48du+v3FMU4dq0sqmohg4dKlP0tjBnHPvDj1S I1DlYlfYcX1zLXISUmzwBntAUr7s5cGybBSaMchGyX0UWqOmv8ACyUo53X2EEQ9/bl GH9D51h3HH8FslMfXPhs4NjBIt1TXTUBQrdjHTN8= Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit From: Adhemerval Zanella To: glibc-cvs@sourceware.org Subject: [glibc/azanella/clang] linux: Avoid shifting a negative signed on POSIX timer interface X-Act-Checkin: glibc X-Git-Author: Adhemerval Zanella X-Git-Refname: refs/heads/azanella/clang X-Git-Oldrev: f3de9de2b43d5e0f69036eae77f8508962a48903 X-Git-Newrev: 1b69625a0a0bde39e87f697a74cce90a026db78a Message-Id: <20221004125527.DEAB93858D3C@sourceware.org> Date: Tue, 4 Oct 2022 12:55:27 +0000 (GMT) List-Id: https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=1b69625a0a0bde39e87f697a74cce90a026db78a commit 1b69625a0a0bde39e87f697a74cce90a026db78a Author: Adhemerval Zanella Date: Wed Mar 9 17:12:03 2022 -0300 linux: Avoid shifting a negative signed on POSIX timer interface The current macros uses pid as signed value, which triggers a compiler warning for process and thread timers. Replace MAKE_PROCESS_CPUCLOCK with static inline function that expects the pid as unsigned. These are similar to what Linux does internally. Checked on x86_64-linux-gnu. Diff: --- nptl/pthread_getcpuclockid.c | 2 +- sysdeps/unix/sysv/linux/clock_getcpuclockid.c | 2 +- sysdeps/unix/sysv/linux/clock_nanosleep.c | 2 +- sysdeps/unix/sysv/linux/kernel-posix-cpu-timers.h | 28 +++++++++++++++++++---- sysdeps/unix/sysv/linux/timer_create.c | 4 ++-- 5 files changed, 28 insertions(+), 10 deletions(-) diff --git a/nptl/pthread_getcpuclockid.c b/nptl/pthread_getcpuclockid.c index 344bd6560e..b8bf09f550 100644 --- a/nptl/pthread_getcpuclockid.c +++ b/nptl/pthread_getcpuclockid.c @@ -35,7 +35,7 @@ __pthread_getcpuclockid (pthread_t threadid, clockid_t *clockid) /* The clockid_t value is a simple computation from the TID. */ - const clockid_t tidclock = MAKE_THREAD_CPUCLOCK (pd->tid, CPUCLOCK_SCHED); + const clockid_t tidclock = make_thread_cpuclock (pd->tid, CPUCLOCK_SCHED); *clockid = tidclock; return 0; diff --git a/sysdeps/unix/sysv/linux/clock_getcpuclockid.c b/sysdeps/unix/sysv/linux/clock_getcpuclockid.c index 5534127ed7..355d3c86af 100644 --- a/sysdeps/unix/sysv/linux/clock_getcpuclockid.c +++ b/sysdeps/unix/sysv/linux/clock_getcpuclockid.c @@ -29,7 +29,7 @@ __clock_getcpuclockid (pid_t pid, clockid_t *clock_id) /* The clockid_t value is a simple computation from the PID. But we do a clock_getres call to validate it. */ - const clockid_t pidclock = MAKE_PROCESS_CPUCLOCK (pid, CPUCLOCK_SCHED); + const clockid_t pidclock = make_process_cpuclock (pid, CPUCLOCK_SCHED); #ifndef __NR_clock_getres_time64 # define __NR_clock_getres_time64 __NR_clock_getres diff --git a/sysdeps/unix/sysv/linux/clock_nanosleep.c b/sysdeps/unix/sysv/linux/clock_nanosleep.c index befe6ecb8c..e610fd4e8d 100644 --- a/sysdeps/unix/sysv/linux/clock_nanosleep.c +++ b/sysdeps/unix/sysv/linux/clock_nanosleep.c @@ -34,7 +34,7 @@ __clock_nanosleep_time64 (clockid_t clock_id, int flags, if (clock_id == CLOCK_THREAD_CPUTIME_ID) return EINVAL; if (clock_id == CLOCK_PROCESS_CPUTIME_ID) - clock_id = MAKE_PROCESS_CPUCLOCK (0, CPUCLOCK_SCHED); + clock_id = PROCESS_CLOCK; /* If the call is interrupted by a signal handler or encounters an error, it returns a positive value similar to errno. */ diff --git a/sysdeps/unix/sysv/linux/kernel-posix-cpu-timers.h b/sysdeps/unix/sysv/linux/kernel-posix-cpu-timers.h index 164a90ddeb..bea1e0e62d 100644 --- a/sysdeps/unix/sysv/linux/kernel-posix-cpu-timers.h +++ b/sysdeps/unix/sysv/linux/kernel-posix-cpu-timers.h @@ -1,4 +1,12 @@ -/* Parameters for the Linux kernel ABI for CPU clocks. */ +/* + Parameters for the Linux kernel ABI for CPU clocks, the bit fields within + a clockid: + + - The most significant 29 bits hold either a pid or a file descriptor. + - Bit 2 indicates whether a cpu clock refers to a thread or a process. + - Bits 1 and 0 give the type: PROF=0, VIRT=1, SCHED=2, or FD=3. + - A clockid is invalid if bits 2, 1, and 0 are all set. + */ #define CPUCLOCK_PID(clock) ((pid_t) ~((clock) >> 3)) #define CPUCLOCK_PERTHREAD(clock) \ @@ -12,7 +20,17 @@ #define CPUCLOCK_SCHED 2 #define CPUCLOCK_MAX 3 -#define MAKE_PROCESS_CPUCLOCK(pid, clock) \ - ((~(clockid_t) (pid) << 3) | (clockid_t) (clock)) -#define MAKE_THREAD_CPUCLOCK(tid, clock) \ - MAKE_PROCESS_CPUCLOCK((tid), (clock) | CPUCLOCK_PERTHREAD_MASK) +static inline clockid_t +make_process_cpuclock (unsigned int pid, clockid_t clock) +{ + return ((~pid) << 3) | clock; +} + +static inline clockid_t +make_thread_cpuclock (unsigned int tid, clockid_t clock) +{ + return make_process_cpuclock (tid, clock | CPUCLOCK_PERTHREAD_MASK); +} + +#define PROCESS_CLOCK make_process_cpuclock (0, CPUCLOCK_SCHED) +#define THREAD_CLOCK make_thread_cpuclock (0, CPUCLOCK_SCHED) diff --git a/sysdeps/unix/sysv/linux/timer_create.c b/sysdeps/unix/sysv/linux/timer_create.c index a8b2a41d9e..290324a7ea 100644 --- a/sysdeps/unix/sysv/linux/timer_create.c +++ b/sysdeps/unix/sysv/linux/timer_create.c @@ -33,9 +33,9 @@ ___timer_create (clockid_t clock_id, struct sigevent *evp, timer_t *timerid) { { clockid_t syscall_clockid = (clock_id == CLOCK_PROCESS_CPUTIME_ID - ? MAKE_PROCESS_CPUCLOCK (0, CPUCLOCK_SCHED) + ? PROCESS_CLOCK : clock_id == CLOCK_THREAD_CPUTIME_ID - ? MAKE_THREAD_CPUCLOCK (0, CPUCLOCK_SCHED) + ? THREAD_CLOCK : clock_id); /* If the user wants notification via a thread we need to handle