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Date: Wed, 25 Jul 2012 10:40:34 -0400
From: Josh Boyer <jwboyer@...hat.com>
To: Linus Torvalds <torvalds@...ux-foundation.org>,
Andrew Morton <akpm@...ux-foundation.org>
Cc: law@...hat.com, stable@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH] posix_types.h: Cleanup stale __NFDBITS and related
definitions
Recently, glibc made a change to suppress sign-conversion warnings in FD_SET
(glibc commit ceb9e56b3d1). This uncovered an issue with the kernel's
definition of __NFDBITS if applications #include <linux/types.h> after
including <sys/select.h>. A build failure would be seen when passing the
-Werror=sign-compare and -D_FORTIFY_SOURCE=2 flags to gcc.
It was suggested that the kernel should either match the glibc definition of
__NFDBITS or remove that entirely. The current in-kernel uses of __NFDBITS
can be replaced with BITS_PER_LONG, and there are no uses of the related
__FDELT and __FDMASK defines. Given that, we'll continue the cleanup that
was started with commit 8b3d1cda4f5f ("posix_types: Remove fd_set macros")
and drop the remaining unused macros.
Additionally, linux/time.h has similar macros defined that expand to nothing
so we'll remove those at the same time.
Reported-by: Jeff Law <law@...hat.com>
Suggested-by: Linus Torvalds <torvalds@...ux-foundation.org>
CC: <stable@...r.kernel.org>
Signed-off-by: Josh Boyer <jwboyer@...hat.com>
---
arch/mips/kernel/kspd.c | 2 +-
fs/exec.c | 2 +-
fs/select.c | 10 +++++-----
include/linux/posix_types.h | 18 +++---------------
include/linux/time.h | 8 --------
kernel/exit.c | 2 +-
security/selinux/hooks.c | 2 +-
7 files changed, 12 insertions(+), 32 deletions(-)
diff --git a/arch/mips/kernel/kspd.c b/arch/mips/kernel/kspd.c
index 84d0639..b77f56b 100644
--- a/arch/mips/kernel/kspd.c
+++ b/arch/mips/kernel/kspd.c
@@ -323,7 +323,7 @@ static void sp_cleanup(void)
fdt = files_fdtable(files);
for (;;) {
unsigned long set;
- i = j * __NFDBITS;
+ i = j * BITS_PER_LONG;
if (i >= fdt->max_fds)
break;
set = fdt->open_fds[j++];
diff --git a/fs/exec.c b/fs/exec.c
index da27b91..e95aeed 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -1020,7 +1020,7 @@ static void flush_old_files(struct files_struct * files)
unsigned long set, i;
j++;
- i = j * __NFDBITS;
+ i = j * BITS_PER_LONG;
fdt = files_fdtable(files);
if (i >= fdt->max_fds)
break;
diff --git a/fs/select.c b/fs/select.c
index bae3215..db14c78 100644
--- a/fs/select.c
+++ b/fs/select.c
@@ -345,8 +345,8 @@ static int max_select_fd(unsigned long n, fd_set_bits *fds)
struct fdtable *fdt;
/* handle last in-complete long-word first */
- set = ~(~0UL << (n & (__NFDBITS-1)));
- n /= __NFDBITS;
+ set = ~(~0UL << (n & (BITS_PER_LONG-1)));
+ n /= BITS_PER_LONG;
fdt = files_fdtable(current->files);
open_fds = fdt->open_fds + n;
max = 0;
@@ -373,7 +373,7 @@ get_max:
max++;
set >>= 1;
} while (set);
- max += n * __NFDBITS;
+ max += n * BITS_PER_LONG;
}
return max;
@@ -435,11 +435,11 @@ int do_select(int n, fd_set_bits *fds, struct timespec *end_time)
in = *inp++; out = *outp++; ex = *exp++;
all_bits = in | out | ex;
if (all_bits == 0) {
- i += __NFDBITS;
+ i += BITS_PER_LONG;
continue;
}
- for (j = 0; j < __NFDBITS; ++j, ++i, bit <<= 1) {
+ for (j = 0; j < BITS_PER_LONG; ++j, ++i, bit <<= 1) {
int fput_needed;
if (i >= n)
break;
diff --git a/include/linux/posix_types.h b/include/linux/posix_types.h
index f04c98c..0eb4b4b 100644
--- a/include/linux/posix_types.h
+++ b/include/linux/posix_types.h
@@ -15,26 +15,14 @@
*/
/*
- * Those macros may have been defined in <gnu/types.h>. But we always
- * use the ones here.
+ * This macro may have been defined in <gnu/types.h>. But we always
+ * use the one here.
*/
-#undef __NFDBITS
-#define __NFDBITS (8 * sizeof(unsigned long))
-
#undef __FD_SETSIZE
#define __FD_SETSIZE 1024
-#undef __FDSET_LONGS
-#define __FDSET_LONGS (__FD_SETSIZE/__NFDBITS)
-
-#undef __FDELT
-#define __FDELT(d) ((d) / __NFDBITS)
-
-#undef __FDMASK
-#define __FDMASK(d) (1UL << ((d) % __NFDBITS))
-
typedef struct {
- unsigned long fds_bits [__FDSET_LONGS];
+ unsigned long fds_bits [__FD_SETSIZE / (8 * sizeof(long))];
} __kernel_fd_set;
/* Type of a signal handler. */
diff --git a/include/linux/time.h b/include/linux/time.h
index 179f4d6..c81c5e4 100644
--- a/include/linux/time.h
+++ b/include/linux/time.h
@@ -257,14 +257,6 @@ static __always_inline void timespec_add_ns(struct timespec *a, u64 ns)
#endif /* __KERNEL__ */
-#define NFDBITS __NFDBITS
-
-#define FD_SETSIZE __FD_SETSIZE
-#define FD_SET(fd,fdsetp) __FD_SET(fd,fdsetp)
-#define FD_CLR(fd,fdsetp) __FD_CLR(fd,fdsetp)
-#define FD_ISSET(fd,fdsetp) __FD_ISSET(fd,fdsetp)
-#define FD_ZERO(fdsetp) __FD_ZERO(fdsetp)
-
/*
* Names of the interval timers, and structure
* defining a timer setting:
diff --git a/kernel/exit.c b/kernel/exit.c
index d17f6c4..f65345f 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -483,7 +483,7 @@ static void close_files(struct files_struct * files)
rcu_read_unlock();
for (;;) {
unsigned long set;
- i = j * __NFDBITS;
+ i = j * BITS_PER_LONG;
if (i >= fdt->max_fds)
break;
set = fdt->open_fds[j++];
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 689fe2d..94c45a1 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -2129,7 +2129,7 @@ static inline void flush_unauthorized_files(const struct cred *cred,
int fd;
j++;
- i = j * __NFDBITS;
+ i = j * BITS_PER_LONG;
fdt = files_fdtable(files);
if (i >= fdt->max_fds)
break;
--
1.7.11.2
--
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