summaryrefslogtreecommitdiffstats
path: root/Documentation/preempt-locking.txt
diff options
context:
space:
mode:
authorSebastian Andrzej Siewior <bigeasy@linutronix.de>2019-04-03 18:41:31 +0200
committerBorislav Petkov <bp@suse.de>2019-04-09 19:27:42 +0200
commit6dd677a044e606fd343e31c2108b13d74aec1ca5 (patch)
tree2380722e29b9c01bb565b434e732b54e0efd36c9 /Documentation/preempt-locking.txt
parent39ea9baffda91df8bfee9b45610242a3191ea1ec (diff)
downloadlinux-6dd677a044e606fd343e31c2108b13d74aec1ca5.tar.bz2
x86/fpu: Remove fpu__restore()
There are no users of fpu__restore() so it is time to remove it. The comment regarding fpu__restore() and TS bit is stale since commit b3b0870ef3ffe ("i387: do not preload FPU state at task switch time") and has no meaning since. Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Borislav Petkov <bp@suse.de> Reviewed-by: Dave Hansen <dave.hansen@intel.com> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Cc: Andy Lutomirski <luto@kernel.org> Cc: Aubrey Li <aubrey.li@intel.com> Cc: Babu Moger <Babu.Moger@amd.com> Cc: "Chang S. Bae" <chang.seok.bae@intel.com> Cc: Dmitry Safonov <dima@arista.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Jann Horn <jannh@google.com> Cc: "Jason A. Donenfeld" <Jason@zx2c4.com> Cc: Joerg Roedel <jroedel@suse.de> Cc: Jonathan Corbet <corbet@lwn.net> Cc: kvm ML <kvm@vger.kernel.org> Cc: linux-doc@vger.kernel.org Cc: Nicolai Stange <nstange@suse.de> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Radim Krčmář <rkrcmar@redhat.com> Cc: Rik van Riel <riel@surriel.com> Cc: x86-ml <x86@kernel.org> Link: https://lkml.kernel.org/r/20190403164156.19645-3-bigeasy@linutronix.de
Diffstat (limited to 'Documentation/preempt-locking.txt')
-rw-r--r--Documentation/preempt-locking.txt1
1 files changed, 0 insertions, 1 deletions
diff --git a/Documentation/preempt-locking.txt b/Documentation/preempt-locking.txt
index 509f5a422d57..dce336134e54 100644
--- a/Documentation/preempt-locking.txt
+++ b/Documentation/preempt-locking.txt
@@ -52,7 +52,6 @@ preemption must be disabled around such regions.
Note, some FPU functions are already explicitly preempt safe. For example,
kernel_fpu_begin and kernel_fpu_end will disable and enable preemption.
-However, fpu__restore() must be called with preemption disabled.
RULE #3: Lock acquire and release must be performed by same task