x86 fixes

Linus,

Please pull the latest x86-urgent-for-linus git tree from:

git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86-urgent-for-linus

HEAD: dba69d1092e291e257fb5673a3ad0e4c87878ebc x86, kvm: Call restore_sched_clock_state() only after %gs is initialized

out-of-topic modifications in x86-urgent-for-linus:
---------------------------------------------------
drivers/block/floppy.c # f636520: x86: Remove the ancient and depre

Thanks,

Ingo

------------------>
Andi Kleen (1):
x86: Use -mno-avx when available

Len Brown (1):
x86: Remove the ancient and deprecated disable_hlt() and enable_hlt() facility

Liu, Chuansheng (1):
x86: Preserve lazy irq disable semantics in fixup_irqs()

Marcelo Tosatti (1):
x86, kvm: Call restore_sched_clock_state() only after %gs is initialized

 Documentation/feature-removal-schedule.txt |    8 ------
 arch/x86/Makefile                          |    1 +
 arch/x86/include/asm/processor.h           |   10 -------
 arch/x86/kernel/irq.c                      |    7 ++++-
 arch/x86/kernel/process.c                  |   24 ------------------
 arch/x86/power/cpu.c                       |    2 +-
 drivers/block/floppy.c                     |   36 ----------------------------
 7 files changed, 8 insertions(+), 80 deletions(-)

Documentation/feature-removal-schedule.txt +0 -8

index 0cad480..7c950d4 100644
@@ -6,14 +6,6 @@ be removed from this file.
 
 ---------------------------
 
-What:	x86 floppy disable_hlt
-When:	2012
-Why:	ancient workaround of dubious utility clutters the
-	code used by everybody else.
-Who:	Len Brown <[email protected]>
-
----------------------------
-
 What:	CONFIG_APM_CPU_IDLE, and its ability to call APM BIOS in idle
 When:	2012
 Why:	This optional sub-feature of APM is of dubious reliability,

arch/x86/Makefile +1 -0

index 968dbe2..41a7237 100644
@@ -129,6 +129,7 @@ KBUILD_CFLAGS += -Wno-sign-compare
 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
 # prevent gcc from generating any FP code by mistake
 KBUILD_CFLAGS += $(call cc-option,-mno-sse -mno-mmx -mno-sse2 -mno-3dnow,)
+KBUILD_CFLAGS += $(call cc-option,-mno-avx,)
 
 KBUILD_CFLAGS += $(mflags-y)
 KBUILD_AFLAGS += $(mflags-y)

arch/x86/include/asm/processor.h +0 -10

index 7284c9a..4fa7dcc 100644
@@ -974,16 +974,6 @@ extern bool cpu_has_amd_erratum(const int *);
 #define cpu_has_amd_erratum(x)	(false)
 #endif /* CONFIG_CPU_SUP_AMD */
 
-#ifdef CONFIG_X86_32
-/*
- * disable hlt during certain critical i/o operations
- */
-#define HAVE_DISABLE_HLT
-#endif
-
-void disable_hlt(void);
-void enable_hlt(void);
-
 void cpu_idle_wait(void);
 
 extern unsigned long arch_align_stack(unsigned long sp);

arch/x86/kernel/irq.c +6 -1

index 7943e0c..3dafc60 100644
@@ -282,8 +282,13 @@ void fixup_irqs(void)
 		else if (!(warned++))
 			set_affinity = 0;
 
+		/*
+		 * We unmask if the irq was not marked masked by the
+		 * core code. That respects the lazy irq disable
+		 * behaviour.
+		 */
 		if (!irqd_can_move_in_process_context(data) &&
-		    !irqd_irq_disabled(data) && chip->irq_unmask)
+		    !irqd_irq_masked(data) && chip->irq_unmask)
 			chip->irq_unmask(data);
 
 		raw_spin_unlock(&desc->lock);

arch/x86/kernel/process.c +0 -24

index a33afaa..1d92a5a 100644
@@ -362,34 +362,10 @@ void (*pm_idle)(void);
 EXPORT_SYMBOL(pm_idle);
 #endif
 
-#ifdef CONFIG_X86_32
-/*
- * This halt magic was a workaround for ancient floppy DMA
- * wreckage. It should be safe to remove.
- */
-static int hlt_counter;
-void disable_hlt(void)
-{
-	hlt_counter++;
-}
-EXPORT_SYMBOL(disable_hlt);
-
-void enable_hlt(void)
-{
-	hlt_counter--;
-}
-EXPORT_SYMBOL(enable_hlt);
-
-static inline int hlt_use_halt(void)
-{
-	return (!hlt_counter && boot_cpu_data.hlt_works_ok);
-}
-#else
 static inline int hlt_use_halt(void)
 {
 	return 1;
 }
-#endif
 
 #ifndef CONFIG_SMP
 static inline void play_dead(void)

arch/x86/power/cpu.c +1 -1

index 4793683..218cdb1 100644
@@ -225,13 +225,13 @@ static void __restore_processor_state(struct saved_context *ctxt)
 	fix_processor_context();
 
 	do_fpu_end();
+	x86_platform.restore_sched_clock_state();
 	mtrr_bp_restore();
 }
 
 /* Needed by apm.c */
 void restore_processor_state(void)
 {
-	x86_platform.restore_sched_clock_state();
 	__restore_processor_state(&saved_context);
 }
 #ifdef CONFIG_X86_32

drivers/block/floppy.c +0 -37

index 76a0823..b0b00d7 100644
@@ -1030,37 +1030,6 @@ static int fd_wait_for_completion(unsigned long delay, timeout_fn function)
 	return 0;
 }
 
-static DEFINE_SPINLOCK(floppy_hlt_lock);
-static int hlt_disabled;
-static void floppy_disable_hlt(void)
-{
-	unsigned long flags;
-
-	WARN_ONCE(1, "floppy_disable_hlt() scheduled for removal in 2012");
-	spin_lock_irqsave(&floppy_hlt_lock, flags);
-	if (!hlt_disabled) {
-		hlt_disabled = 1;
-#ifdef HAVE_DISABLE_HLT
-		disable_hlt();
-#endif
-	}
-	spin_unlock_irqrestore(&floppy_hlt_lock, flags);
-}
-
-static void floppy_enable_hlt(void)
-{
-	unsigned long flags;
-
-	spin_lock_irqsave(&floppy_hlt_lock, flags);
-	if (hlt_disabled) {
-		hlt_disabled = 0;
-#ifdef HAVE_DISABLE_HLT
-		enable_hlt();
-#endif
-	}
-	spin_unlock_irqrestore(&floppy_hlt_lock, flags);
-}
-
 static void setup_DMA(void)
 {
 	unsigned long f;

@@ -1105,7 +1074,6 @@ static void setup_DMA(void)
 	fd_enable_dma();
 	release_dma_lock(f);
 #endif
-	floppy_disable_hlt();
 }
 
 static void show_floppy(void);

@@ -1707,7 +1675,6 @@ irqreturn_t floppy_interrupt(int irq, void *dev_id)
 	fd_disable_dma();
 	release_dma_lock(f);
 
-	floppy_enable_hlt();
 	do_floppy = NULL;
 	if (fdc >= N_FDC || FDCS->address == -1) {
 		/* we don't even know which FDC is the culprit */

@@ -1856,8 +1823,6 @@ static void floppy_shutdown(unsigned long data)
 		show_floppy();
 	cancel_activity();
 
-	floppy_enable_hlt();
-
 	flags = claim_dma_lock();
 	fd_disable_dma();
 	release_dma_lock(flags);

@@ -4508,7 +4473,6 @@ static void floppy_release_irq_and_dma(void)
 #if N_FDC > 1
 	set_dor(1, ~8, 0);
 #endif
-	floppy_enable_hlt();
 
 	if (floppy_track_buffer && max_buffer_sectors) {
 		tmpsize = max_buffer_sectors * 1024;
--

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Quoted 4 lines · Ingo Molnar

Linus,

Please pull the latest x86-urgent-for-linus git tree from:

Quoted 1 line

git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86-urgent-for-linus

Hey Ingo,

I was wondering what happend to the two patches to fix the regression introduced by Suresh's patch (the "x86, ioapic: add register checks for bogus io-apic entries")?

Quoted 5 lines · Konrad Rzeszutek Wilk

Quoted 4 lines · Ingo Molnar

Linus,

Please pull the latest x86-urgent-for-linus git tree from:

Quoted 7 lines

Quoted 1 line

git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86-urgent-for-linus

Hey Ingo,

I was wondering what happend to the two patches to fix the regression introduced by Suresh's patch (the "x86, ioapic: add register checks for bogus io-apic entries")?

That's really a Xen bug (if real hw behaves well then Xen can behave well too, right?) - I suggest you should work it around in Xen first - I wanted to wait with applying more invasive ioapic changes, that's probably v3.5 material anyway. The patches arrived in the middle of the merge window.