From 26be459c9c4431984ad4b576f975ce6d3184d71d Mon Sep 17 00:00:00 2001 From: Mathieu Desnoyers Date: Sat, 10 Feb 2018 12:00:58 -0500 Subject: Documentation/features: Allow comments in arch features files The list-arch.sh script considers lines beginning with "#" as match for the feature table. Given that those tables are never in lines beginning with "#", add a reverse grep on "^#" when matching the "ok/TODO" state of the architecture. This allows adding comments within the feature files, for instance describing the architecture requirements for the feature in each architecture. Signed-off-by: Mathieu Desnoyers Cc: Jonathan Corbet Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: linux-doc@vger.kernel.org Link: http://lkml.kernel.org/r/1518282058-24226-1-git-send-email-mathieu.desnoyers@efficios.com Signed-off-by: Ingo Molnar --- Documentation/features/list-arch.sh | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/Documentation/features/list-arch.sh b/Documentation/features/list-arch.sh index c16b5b595688..1ec47c3bb5fa 100755 --- a/Documentation/features/list-arch.sh +++ b/Documentation/features/list-arch.sh @@ -17,7 +17,7 @@ for F in */*/arch-support.txt; do N=$(grep -h "^# Feature name:" $F | cut -c25-) C=$(grep -h "^# Kconfig:" $F | cut -c25-) D=$(grep -h "^# description:" $F | cut -c25-) - S=$(grep -hw $ARCH $F | cut -d\| -f3) + S=$(grep -hv "^#" $F | grep -w $ARCH | cut -d\| -f3) printf "%10s/%-22s:%s| %35s # %s\n" "$SUBSYS" "$N" "$S" "$C" "$D" done -- cgit v1.2.3 From ac65ddad4a23d46529f921fdf8f7b7b6d14a15d8 Mon Sep 17 00:00:00 2001 From: Mathieu Desnoyers Date: Fri, 9 Feb 2018 15:30:56 -0500 Subject: Documentation/features, membarriers: Document membarrier-sync-core architecture support Ensure we gather architecture requirements about each architecture supporting the "sync_core" membarrier command in a single file under Documentation/features. Signed-off-by: Mathieu Desnoyers Cc: Andrea Parri Cc: Andrew Hunter Cc: Andy Lutomirski Cc: Avi Kivity Cc: Benjamin Herrenschmidt Cc: Boqun Feng Cc: Dave Watson Cc: David Sehr Cc: Greg Hackmann Cc: Jonathan Corbet Cc: Linus Torvalds Cc: Maged Michael Cc: Michael Ellerman Cc: Paul E. McKenney Cc: Paul Mackerras Cc: Peter Zijlstra Cc: Russell King Cc: Thomas Gleixner Cc: Will Deacon Cc: linux-api@vger.kernel.org Cc: linux-arch@vger.kernel.org Cc: linux-doc@vger.kernel.org Link: http://lkml.kernel.org/r/1518208256-22034-1-git-send-email-mathieu.desnoyers@efficios.com Signed-off-by: Ingo Molnar --- .../sched/membarrier-sync-core/arch-support.txt | 62 ++++++++++++++++++++++ 1 file changed, 62 insertions(+) create mode 100644 Documentation/features/sched/membarrier-sync-core/arch-support.txt diff --git a/Documentation/features/sched/membarrier-sync-core/arch-support.txt b/Documentation/features/sched/membarrier-sync-core/arch-support.txt new file mode 100644 index 000000000000..2c815a7f1ba7 --- /dev/null +++ b/Documentation/features/sched/membarrier-sync-core/arch-support.txt @@ -0,0 +1,62 @@ +# +# Feature name: membarrier-sync-core +# Kconfig: ARCH_HAS_MEMBARRIER_SYNC_CORE +# description: arch supports core serializing membarrier +# +# Architecture requirements +# +# * arm64 +# +# Rely on eret context synchronization when returning from IPI handler, and +# when returning to user-space. +# +# * x86 +# +# x86-32 uses IRET as return from interrupt, which takes care of the IPI. +# However, it uses both IRET and SYSEXIT to go back to user-space. The IRET +# instruction is core serializing, but not SYSEXIT. +# +# x86-64 uses IRET as return from interrupt, which takes care of the IPI. +# However, it can return to user-space through either SYSRETL (compat code), +# SYSRETQ, or IRET. +# +# Given that neither SYSRET{L,Q}, nor SYSEXIT, are core serializing, we rely +# instead on write_cr3() performed by switch_mm() to provide core serialization +# after changing the current mm, and deal with the special case of kthread -> +# uthread (temporarily keeping current mm into active_mm) by issuing a +# sync_core_before_usermode() in that specific case. +# + ----------------------- + | arch |status| + ----------------------- + | alpha: | TODO | + | arc: | TODO | + | arm: | TODO | + | arm64: | ok | + | blackfin: | TODO | + | c6x: | TODO | + | cris: | TODO | + | frv: | TODO | + | h8300: | TODO | + | hexagon: | TODO | + | ia64: | TODO | + | m32r: | TODO | + | m68k: | TODO | + | metag: | TODO | + | microblaze: | TODO | + | mips: | TODO | + | mn10300: | TODO | + | nios2: | TODO | + | openrisc: | TODO | + | parisc: | TODO | + | powerpc: | TODO | + | s390: | TODO | + | score: | TODO | + | sh: | TODO | + | sparc: | TODO | + | tile: | TODO | + | um: | TODO | + | unicore32: | TODO | + | x86: | ok | + | xtensa: | TODO | + ----------------------- -- cgit v1.2.3 From 5ad751053704df3f00d2bb2dc9345c697c212150 Mon Sep 17 00:00:00 2001 From: Borislav Petkov Date: Tue, 6 Mar 2018 10:49:12 +0100 Subject: panic: Add closing panic marker parenthesis Otherwise it looks unbalanced. Signed-off-by: Borislav Petkov Signed-off-by: Thomas Gleixner Cc: Peter Zijlstra Cc: Josh Poimboeuf Cc: Linus Torvalds Cc: Andy Lutomirski Link: https://lkml.kernel.org/r/20180306094920.16917-2-bp@alien8.de --- kernel/panic.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/panic.c b/kernel/panic.c index 2cfef408fec9..9fb023d0cae1 100644 --- a/kernel/panic.c +++ b/kernel/panic.c @@ -289,7 +289,7 @@ void panic(const char *fmt, ...) disabled_wait(caller); } #endif - pr_emerg("---[ end Kernel panic - not syncing: %s\n", buf); + pr_emerg("---[ end Kernel panic - not syncing: %s ]---\n", buf); local_irq_enable(); for (i = 0; ; i += PANIC_TIMER_STEP) { touch_softlockup_watchdog(); -- cgit v1.2.3