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Date: Sun, 11 Oct 2009 20:03:38 +1100
From: Benjamin Herrenschmidt <benh@...nel.crashing.org>
To: Thomas Gleixner <tglx@...utronix.de>
Cc: LKML <linux-kernel@...r.kernel.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Ingo Molnar <mingo@...e.hu>,
Peter Zijlstra <peterz@...radead.org>,
Frederic Weisbecker <fweisbec@...il.com>,
Vincent Sanders <vince@...tec.co.uk>,
John Kacur <jkacur@...hat.com>,
Jonathan Corbet <corbet@....net>,
Christoph Hellwig <hch@...radead.org>,
Tony Luck <tony.luck@...el.com>,
Ralf Baechle <ralf@...ux-mips.org>,
Martin Schwidefsky <schwidefsky@...ibm.com>,
"David S. Miller" <davem@...emloft.net>
Subject: Re: [patch 21/28] bkl: pushdown BKL locking to do_sysctl()
On Sat, 2009-10-10 at 15:37 +0000, Thomas Gleixner wrote:
> plain text document attachment (push-bkl-to-do-sysctl.patch)
> Push lock/unlock_kernel() into do_sysctl() and remove it from all call
> sites of do_sysctl().
>
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> Cc: Tony Luck <tony.luck@...el.com>
> Cc: Ralf Baechle <ralf@...ux-mips.org>
> Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> Cc: Martin Schwidefsky <schwidefsky@...ibm.com>
> Cc: "David S. Miller" <davem@...emloft.net>
For the powerpc parts,
Acked-by: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> ---
> arch/ia64/ia32/sys_ia32.c | 2 --
> arch/mips/kernel/linux32.c | 2 --
> arch/parisc/kernel/sys_parisc32.c | 2 --
> arch/powerpc/kernel/sys_ppc32.c | 2 --
> arch/s390/kernel/compat_linux.c | 2 --
> arch/sparc/kernel/sys_sparc32.c | 2 --
> arch/x86/ia32/sys_ia32.c | 2 --
> kernel/sysctl.c | 6 ++++--
> 8 files changed, 4 insertions(+), 16 deletions(-)
>
> Index: linux-2.6-tip/arch/ia64/ia32/sys_ia32.c
> ===================================================================
> --- linux-2.6-tip.orig/arch/ia64/ia32/sys_ia32.c
> +++ linux-2.6-tip/arch/ia64/ia32/sys_ia32.c
> @@ -1670,10 +1670,8 @@ sys32_sysctl (struct sysctl32 __user *ar
> return -EFAULT;
>
> set_fs(KERNEL_DS);
> - lock_kernel();
> ret = do_sysctl(namep, a32.nlen, oldvalp, (size_t __user *) &oldlen,
> newvalp, (size_t) a32.newlen);
> - unlock_kernel();
> set_fs(old_fs);
>
> if (oldvalp && put_user (oldlen, (int __user *) compat_ptr(a32.oldlenp)))
> Index: linux-2.6-tip/arch/mips/kernel/linux32.c
> ===================================================================
> --- linux-2.6-tip.orig/arch/mips/kernel/linux32.c
> +++ linux-2.6-tip/arch/mips/kernel/linux32.c
> @@ -302,10 +302,8 @@ SYSCALL_DEFINE1(32_sysctl, struct sysctl
> oldlenp = (size_t __user *)addr;
> }
>
> - lock_kernel();
> error = do_sysctl((int __user *)A(tmp.name), tmp.nlen, (void __user *)A(tmp.oldval),
> oldlenp, (void __user *)A(tmp.newval), tmp.newlen);
> - unlock_kernel();
> if (oldlenp) {
> if (!error) {
> if (get_user(oldlen, (size_t __user *)addr) ||
> Index: linux-2.6-tip/arch/parisc/kernel/sys_parisc32.c
> ===================================================================
> --- linux-2.6-tip.orig/arch/parisc/kernel/sys_parisc32.c
> +++ linux-2.6-tip/arch/parisc/kernel/sys_parisc32.c
> @@ -137,11 +137,9 @@ asmlinkage long sys32_sysctl(struct __sy
> oldlenp = (size_t *)addr;
> }
>
> - lock_kernel();
> error = do_sysctl((int __user *)(u64)tmp.name, tmp.nlen,
> (void __user *)(u64)tmp.oldval, oldlenp,
> (void __user *)(u64)tmp.newval, tmp.newlen);
> - unlock_kernel();
> if (oldlenp) {
> if (!error) {
> if (get_user(oldlen, (size_t *)addr)) {
> Index: linux-2.6-tip/arch/powerpc/kernel/sys_ppc32.c
> ===================================================================
> --- linux-2.6-tip.orig/arch/powerpc/kernel/sys_ppc32.c
> +++ linux-2.6-tip/arch/powerpc/kernel/sys_ppc32.c
> @@ -555,11 +555,9 @@ asmlinkage long compat_sys_sysctl(struct
> return -EFAULT;
> }
>
> - lock_kernel();
> error = do_sysctl(compat_ptr(tmp.name), tmp.nlen,
> compat_ptr(tmp.oldval), oldlenp,
> compat_ptr(tmp.newval), tmp.newlen);
> - unlock_kernel();
> if (oldlenp) {
> if (!error) {
> if (get_user(oldlen, oldlenp) ||
> Index: linux-2.6-tip/arch/s390/kernel/compat_linux.c
> ===================================================================
> --- linux-2.6-tip.orig/arch/s390/kernel/compat_linux.c
> +++ linux-2.6-tip/arch/s390/kernel/compat_linux.c
> @@ -562,10 +562,8 @@ asmlinkage long sys32_sysctl(struct __sy
> oldlenp = (size_t __user *)addr;
> }
>
> - lock_kernel();
> error = do_sysctl(compat_ptr(tmp.name), tmp.nlen, compat_ptr(tmp.oldval),
> oldlenp, compat_ptr(tmp.newval), tmp.newlen);
> - unlock_kernel();
> if (oldlenp) {
> if (!error) {
> if (get_user(oldlen, (size_t __user *)addr) ||
> Index: linux-2.6-tip/arch/sparc/kernel/sys_sparc32.c
> ===================================================================
> --- linux-2.6-tip.orig/arch/sparc/kernel/sys_sparc32.c
> +++ linux-2.6-tip/arch/sparc/kernel/sys_sparc32.c
> @@ -627,14 +627,12 @@ asmlinkage long sys32_sysctl(struct __sy
> oldlenp = (size_t __user *)addr;
> }
>
> - lock_kernel();
> error = do_sysctl((int __user *)(unsigned long) tmp.name,
> tmp.nlen,
> (void __user *)(unsigned long) tmp.oldval,
> oldlenp,
> (void __user *)(unsigned long) tmp.newval,
> tmp.newlen);
> - unlock_kernel();
> if (oldlenp) {
> if (!error) {
> if (get_user(oldlen, (size_t __user *)addr) ||
> Index: linux-2.6-tip/arch/x86/ia32/sys_ia32.c
> ===================================================================
> --- linux-2.6-tip.orig/arch/x86/ia32/sys_ia32.c
> +++ linux-2.6-tip/arch/x86/ia32/sys_ia32.c
> @@ -477,10 +477,8 @@ asmlinkage long sys32_sysctl(struct sysc
> return -EFAULT;
>
> set_fs(KERNEL_DS);
> - lock_kernel();
> ret = do_sysctl(namep, a32.nlen, oldvalp, (size_t __user *)&oldlen,
> newvalp, (size_t) a32.newlen);
> - unlock_kernel();
> set_fs(old_fs);
>
> if (oldvalp && put_user(oldlen, (int __user *)compat_ptr(a32.oldlenp)))
> Index: linux-2.6-tip/kernel/sysctl.c
> ===================================================================
> --- linux-2.6-tip.orig/kernel/sysctl.c
> +++ linux-2.6-tip/kernel/sysctl.c
> @@ -1848,6 +1848,8 @@ int do_sysctl(int __user *name, int nlen
> return -EFAULT;
> }
>
> + lock_kernel();
> +
> for (head = sysctl_head_next(NULL); head;
> head = sysctl_head_next(head)) {
> error = parse_table(name, nlen, oldval, oldlenp,
> @@ -1858,6 +1860,8 @@ int do_sysctl(int __user *name, int nlen
> break;
> }
> }
> +
> + unlock_kernel();
> return error;
> }
>
> @@ -1873,10 +1877,8 @@ SYSCALL_DEFINE1(sysctl, struct __sysctl_
> if (error)
> goto out;
>
> - lock_kernel();
> error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
> tmp.newval, tmp.newlen);
> - unlock_kernel();
> out:
> return error;
> }
>
--
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