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Message-Id: <20181127035133.225592-2-dianders@chromium.org>
Date: Mon, 26 Nov 2018 19:51:30 -0800
From: Douglas Anderson <dianders@...omium.org>
To: Jason Wessel <jason.wessel@...driver.com>,
Daniel Thompson <daniel.thompson@...aro.org>
Cc: Will Deacon <will.deacon@....com>,
kgdb-bugreport@...ts.sourceforge.net,
Peter Zijlstra <peterz@...radead.org>,
Douglas Anderson <dianders@...omium.org>,
linux-mips@...ux-mips.org, linux-sh@...r.kernel.org,
Borislav Petkov <bp@...en8.de>, linux-kernel@...r.kernel.org,
sparclinux@...r.kernel.org,
Catalin Marinas <catalin.marinas@....com>,
James Hogan <jhogan@...nel.org>, linux-hexagon@...r.kernel.org,
x86@...nel.org, Vineet Gupta <vgupta@...opsys.com>,
Thomas Gleixner <tglx@...utronix.de>,
Michal Hocko <mhocko@...e.com>,
Ralf Baechle <ralf@...ux-mips.org>,
linux-snps-arc@...ts.infradead.org,
Andrew Morton <akpm@...ux-foundation.org>,
"H. Peter Anvin" <hpa@...or.com>,
Yoshinori Sato <ysato@...rs.sourceforge.jp>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Paul Burton <paul.burton@...s.com>,
Ingo Molnar <mingo@...hat.com>,
Russell King <linux@...linux.org.uk>,
linux-arm-kernel@...ts.infradead.org,
Christophe Leroy <christophe.leroy@....fr>,
Huang Ying <ying.huang@...el.com>,
"David S. Miller" <davem@...emloft.net>,
Rich Felker <dalias@...c.org>,
Michael Ellerman <mpe@...erman.id.au>,
Mike Rapoport <rppt@...ux.vnet.ibm.com>,
Paul Mackerras <paulus@...ba.org>,
Richard Kuo <rkuo@...eaurora.org>,
linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH v5 1/4] kgdb: Remove irq flags from roundup
The function kgdb_roundup_cpus() was passed a parameter that was
documented as:
> the flags that will be used when restoring the interrupts. There is
> local_irq_save() call before kgdb_roundup_cpus().
Nobody used those flags. Anyone who wanted to temporarily turn on
interrupts just did local_irq_enable() and local_irq_disable() without
looking at them. So we can definitely remove the flags.
Signed-off-by: Douglas Anderson <dianders@...omium.org>
Acked-by: Will Deacon <will.deacon@....com>
---
Changes in v5: None
Changes in v4: None
Changes in v3: None
Changes in v2:
- Removing irq flags separated from fixing lockdep splat.
arch/arc/kernel/kgdb.c | 2 +-
arch/arm/kernel/kgdb.c | 2 +-
arch/arm64/kernel/kgdb.c | 2 +-
arch/hexagon/kernel/kgdb.c | 9 ++-------
arch/mips/kernel/kgdb.c | 2 +-
arch/powerpc/kernel/kgdb.c | 2 +-
arch/sh/kernel/kgdb.c | 2 +-
arch/sparc/kernel/smp_64.c | 2 +-
arch/x86/kernel/kgdb.c | 9 ++-------
include/linux/kgdb.h | 9 ++-------
kernel/debug/debug_core.c | 2 +-
11 files changed, 14 insertions(+), 29 deletions(-)
diff --git a/arch/arc/kernel/kgdb.c b/arch/arc/kernel/kgdb.c
index 9a3c34af2ae8..0932851028e0 100644
--- a/arch/arc/kernel/kgdb.c
+++ b/arch/arc/kernel/kgdb.c
@@ -197,7 +197,7 @@ static void kgdb_call_nmi_hook(void *ignored)
kgdb_nmicallback(raw_smp_processor_id(), NULL);
}
-void kgdb_roundup_cpus(unsigned long flags)
+void kgdb_roundup_cpus(void)
{
local_irq_enable();
smp_call_function(kgdb_call_nmi_hook, NULL, 0);
diff --git a/arch/arm/kernel/kgdb.c b/arch/arm/kernel/kgdb.c
index caa0dbe3dc61..f21077b077be 100644
--- a/arch/arm/kernel/kgdb.c
+++ b/arch/arm/kernel/kgdb.c
@@ -175,7 +175,7 @@ static void kgdb_call_nmi_hook(void *ignored)
kgdb_nmicallback(raw_smp_processor_id(), get_irq_regs());
}
-void kgdb_roundup_cpus(unsigned long flags)
+void kgdb_roundup_cpus(void)
{
local_irq_enable();
smp_call_function(kgdb_call_nmi_hook, NULL, 0);
diff --git a/arch/arm64/kernel/kgdb.c b/arch/arm64/kernel/kgdb.c
index a20de58061a8..12c339ff6e75 100644
--- a/arch/arm64/kernel/kgdb.c
+++ b/arch/arm64/kernel/kgdb.c
@@ -289,7 +289,7 @@ static void kgdb_call_nmi_hook(void *ignored)
kgdb_nmicallback(raw_smp_processor_id(), get_irq_regs());
}
-void kgdb_roundup_cpus(unsigned long flags)
+void kgdb_roundup_cpus(void)
{
local_irq_enable();
smp_call_function(kgdb_call_nmi_hook, NULL, 0);
diff --git a/arch/hexagon/kernel/kgdb.c b/arch/hexagon/kernel/kgdb.c
index 16c24b22d0b2..012e0e230ac2 100644
--- a/arch/hexagon/kernel/kgdb.c
+++ b/arch/hexagon/kernel/kgdb.c
@@ -119,17 +119,12 @@ void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long pc)
/**
* kgdb_roundup_cpus - Get other CPUs into a holding pattern
- * @flags: Current IRQ state
*
* On SMP systems, we need to get the attention of the other CPUs
* and get them be in a known state. This should do what is needed
* to get the other CPUs to call kgdb_wait(). Note that on some arches,
* the NMI approach is not used for rounding up all the CPUs. For example,
- * in case of MIPS, smp_call_function() is used to roundup CPUs. In
- * this case, we have to make sure that interrupts are enabled before
- * calling smp_call_function(). The argument to this function is
- * the flags that will be used when restoring the interrupts. There is
- * local_irq_save() call before kgdb_roundup_cpus().
+ * in case of MIPS, smp_call_function() is used to roundup CPUs.
*
* On non-SMP systems, this is not called.
*/
@@ -139,7 +134,7 @@ static void hexagon_kgdb_nmi_hook(void *ignored)
kgdb_nmicallback(raw_smp_processor_id(), get_irq_regs());
}
-void kgdb_roundup_cpus(unsigned long flags)
+void kgdb_roundup_cpus(void)
{
local_irq_enable();
smp_call_function(hexagon_kgdb_nmi_hook, NULL, 0);
diff --git a/arch/mips/kernel/kgdb.c b/arch/mips/kernel/kgdb.c
index eb6c0d582626..2b05effc17b4 100644
--- a/arch/mips/kernel/kgdb.c
+++ b/arch/mips/kernel/kgdb.c
@@ -219,7 +219,7 @@ static void kgdb_call_nmi_hook(void *ignored)
set_fs(old_fs);
}
-void kgdb_roundup_cpus(unsigned long flags)
+void kgdb_roundup_cpus(void)
{
local_irq_enable();
smp_call_function(kgdb_call_nmi_hook, NULL, 0);
diff --git a/arch/powerpc/kernel/kgdb.c b/arch/powerpc/kernel/kgdb.c
index 59c578f865aa..b0e804844be0 100644
--- a/arch/powerpc/kernel/kgdb.c
+++ b/arch/powerpc/kernel/kgdb.c
@@ -124,7 +124,7 @@ static int kgdb_call_nmi_hook(struct pt_regs *regs)
}
#ifdef CONFIG_SMP
-void kgdb_roundup_cpus(unsigned long flags)
+void kgdb_roundup_cpus(void)
{
smp_send_debugger_break();
}
diff --git a/arch/sh/kernel/kgdb.c b/arch/sh/kernel/kgdb.c
index 4f04c6638a4d..cc57630f6bf2 100644
--- a/arch/sh/kernel/kgdb.c
+++ b/arch/sh/kernel/kgdb.c
@@ -319,7 +319,7 @@ static void kgdb_call_nmi_hook(void *ignored)
kgdb_nmicallback(raw_smp_processor_id(), get_irq_regs());
}
-void kgdb_roundup_cpus(unsigned long flags)
+void kgdb_roundup_cpus(void)
{
local_irq_enable();
smp_call_function(kgdb_call_nmi_hook, NULL, 0);
diff --git a/arch/sparc/kernel/smp_64.c b/arch/sparc/kernel/smp_64.c
index 4792e08ad36b..f45d876983f1 100644
--- a/arch/sparc/kernel/smp_64.c
+++ b/arch/sparc/kernel/smp_64.c
@@ -1014,7 +1014,7 @@ void flush_dcache_page_all(struct mm_struct *mm, struct page *page)
}
#ifdef CONFIG_KGDB
-void kgdb_roundup_cpus(unsigned long flags)
+void kgdb_roundup_cpus(void)
{
smp_cross_call(&xcall_kgdb_capture, 0, 0, 0);
}
diff --git a/arch/x86/kernel/kgdb.c b/arch/x86/kernel/kgdb.c
index 8e36f249646e..ac6291a4178d 100644
--- a/arch/x86/kernel/kgdb.c
+++ b/arch/x86/kernel/kgdb.c
@@ -422,21 +422,16 @@ static void kgdb_disable_hw_debug(struct pt_regs *regs)
#ifdef CONFIG_SMP
/**
* kgdb_roundup_cpus - Get other CPUs into a holding pattern
- * @flags: Current IRQ state
*
* On SMP systems, we need to get the attention of the other CPUs
* and get them be in a known state. This should do what is needed
* to get the other CPUs to call kgdb_wait(). Note that on some arches,
* the NMI approach is not used for rounding up all the CPUs. For example,
- * in case of MIPS, smp_call_function() is used to roundup CPUs. In
- * this case, we have to make sure that interrupts are enabled before
- * calling smp_call_function(). The argument to this function is
- * the flags that will be used when restoring the interrupts. There is
- * local_irq_save() call before kgdb_roundup_cpus().
+ * in case of MIPS, smp_call_function() is used to roundup CPUs.
*
* On non-SMP systems, this is not called.
*/
-void kgdb_roundup_cpus(unsigned long flags)
+void kgdb_roundup_cpus(void)
{
apic->send_IPI_allbutself(APIC_DM_NMI);
}
diff --git a/include/linux/kgdb.h b/include/linux/kgdb.h
index e465bb15912d..05e5b2eb0d32 100644
--- a/include/linux/kgdb.h
+++ b/include/linux/kgdb.h
@@ -178,21 +178,16 @@ kgdb_arch_handle_exception(int vector, int signo, int err_code,
/**
* kgdb_roundup_cpus - Get other CPUs into a holding pattern
- * @flags: Current IRQ state
*
* On SMP systems, we need to get the attention of the other CPUs
* and get them into a known state. This should do what is needed
* to get the other CPUs to call kgdb_wait(). Note that on some arches,
* the NMI approach is not used for rounding up all the CPUs. For example,
- * in case of MIPS, smp_call_function() is used to roundup CPUs. In
- * this case, we have to make sure that interrupts are enabled before
- * calling smp_call_function(). The argument to this function is
- * the flags that will be used when restoring the interrupts. There is
- * local_irq_save() call before kgdb_roundup_cpus().
+ * in case of MIPS, smp_call_function() is used to roundup CPUs.
*
* On non-SMP systems, this is not called.
*/
-extern void kgdb_roundup_cpus(unsigned long flags);
+extern void kgdb_roundup_cpus(void);
/**
* kgdb_arch_set_pc - Generic call back to the program counter
diff --git a/kernel/debug/debug_core.c b/kernel/debug/debug_core.c
index 65c0f1363788..f3cadda45f07 100644
--- a/kernel/debug/debug_core.c
+++ b/kernel/debug/debug_core.c
@@ -593,7 +593,7 @@ static int kgdb_cpu_enter(struct kgdb_state *ks, struct pt_regs *regs,
/* Signal the other CPUs to enter kgdb_wait() */
else if ((!kgdb_single_step) && kgdb_do_roundup)
- kgdb_roundup_cpus(flags);
+ kgdb_roundup_cpus();
#endif
/*
--
2.20.0.rc0.387.gc7a69e6b6c-goog
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