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From: H. Peter Anvin on 13 Aug 2010 19:00
Hi Linus,

Second x86/uv batch, as promised.

The following changes since commit 2be1f3a73dd02e38e181cf5abacb3d45a6a2d6b8:

Merge branch 'for-linus' of git://git390.marist.edu/pub/scm/linux-2.6 (2010-08-13 10:54:04 -0700)

are available in the git repository at:

git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip.git x86-uv-for-linus

Cliff Wickman (3):
x86, UV: Make kdump avoid stack dumps
x86, UV: Initialize BAU hub map
x86, UV: Make kdump avoid stack dumps - fix !CONFIG_KEXEC breakage

arch/x86/include/asm/kdebug.h | 6 ++++++
arch/x86/kernel/apic/x2apic_uv_x.c | 4 ++++
arch/x86/kernel/crash.c | 3 +++
arch/x86/kernel/tlb_uv.c | 26 ++++++++++++++------------
4 files changed, 27 insertions(+), 12 deletions(-)

diff --git a/arch/x86/include/asm/kdebug.h b/arch/x86/include/asm/kdebug.h
index fa7c0b9..5bdfca8 100644
--- a/arch/x86/include/asm/kdebug.h
+++ b/arch/x86/include/asm/kdebug.h
@@ -33,5 +33,11 @@ extern void __show_regs(struct pt_regs *regs, int all);
extern void show_regs(struct pt_regs *regs);
extern unsigned long oops_begin(void);
extern void oops_end(unsigned long, struct pt_regs *, int signr);
+#ifdef CONFIG_KEXEC
+extern int in_crash_kexec;
+#else
+/* no crash dump is ever in progress if no crash kernel can be kexec'd */
+#define in_crash_kexec 0
+#endif

#endif /* _ASM_X86_KDEBUG_H */
diff --git a/arch/x86/kernel/apic/x2apic_uv_x.c b/arch/x86/kernel/apic/x2apic_uv_x.c
index e46f98f..7b598b8 100644
--- a/arch/x86/kernel/apic/x2apic_uv_x.c
+++ b/arch/x86/kernel/apic/x2apic_uv_x.c
@@ -604,6 +604,10 @@ int uv_handle_nmi(struct notifier_block *self, unsigned long reason, void *data)
{
if (reason != DIE_NMI_IPI)
return NOTIFY_OK;
+
+ if (in_crash_kexec)
+ /* do nothing if entering the crash kernel */
+ return NOTIFY_OK;
/*
* Use a lock so only one cpu prints at a time
* to prevent intermixed output.
diff --git a/arch/x86/kernel/crash.c b/arch/x86/kernel/crash.c
index ebd4c51..764c7c2 100644
--- a/arch/x86/kernel/crash.c
+++ b/arch/x86/kernel/crash.c
@@ -28,6 +28,8 @@
#include <asm/reboot.h>
#include <asm/virtext.h>

+int in_crash_kexec;
+
#if defined(CONFIG_SMP) && defined(CONFIG_X86_LOCAL_APIC)

static void kdump_nmi_callback(int cpu, struct die_args *args)
@@ -61,6 +63,7 @@ static void kdump_nmi_callback(int cpu, struct die_args *args)

static void kdump_nmi_shootdown_cpus(void)
{
+ in_crash_kexec = 1;
nmi_shootdown_cpus(kdump_nmi_callback);

disable_local_APIC();
diff --git a/arch/x86/kernel/tlb_uv.c b/arch/x86/kernel/tlb_uv.c
index 59efb53..312ef02 100644
--- a/arch/x86/kernel/tlb_uv.c
+++ b/arch/x86/kernel/tlb_uv.c
@@ -1484,15 +1484,16 @@ calculate_destination_timeout(void)
/*
* initialize the bau_control structure for each cpu
*/
-static void uv_init_per_cpu(int nuvhubs)
+static void __init uv_init_per_cpu(int nuvhubs)
{
int i;
int cpu;
int pnode;
int uvhub;
+ int have_hmaster;
short socket = 0;
unsigned short socket_mask;
- unsigned int uvhub_mask;
+ unsigned char *uvhub_mask;
struct bau_control *bcp;
struct uvhub_desc *bdp;
struct socket_desc *sdp;
@@ -1516,28 +1517,29 @@ static void uv_init_per_cpu(int nuvhubs)
uvhub_descs = (struct uvhub_desc *)
kmalloc(nuvhubs * sizeof(struct uvhub_desc), GFP_KERNEL);
memset(uvhub_descs, 0, nuvhubs * sizeof(struct uvhub_desc));
+ uvhub_mask = kzalloc((nuvhubs+7)/8, GFP_KERNEL);
for_each_present_cpu(cpu) {
bcp = &per_cpu(bau_control, cpu);
memset(bcp, 0, sizeof(struct bau_control));
pnode = uv_cpu_hub_info(cpu)->pnode;
uvhub = uv_cpu_hub_info(cpu)->numa_blade_id;
- uvhub_mask |= (1 << uvhub);
+ *(uvhub_mask + (uvhub/8)) |= (1 << (uvhub%8));
bdp = &uvhub_descs[uvhub];
bdp->num_cpus++;
bdp->uvhub = uvhub;
bdp->pnode = pnode;
/* kludge: 'assuming' one node per socket, and assuming that
disabling a socket just leaves a gap in node numbers */
- socket = (cpu_to_node(cpu) & 1);;
+ socket = (cpu_to_node(cpu) & 1);
bdp->socket_mask |= (1 << socket);
sdp = &bdp->socket[socket];
sdp->cpu_number[sdp->num_cpus] = cpu;
sdp->num_cpus++;
}
- uvhub = 0;
- while (uvhub_mask) {
- if (!(uvhub_mask & 1))
- goto nexthub;
+ for (uvhub = 0; uvhub < nuvhubs; uvhub++) {
+ if (!(*(uvhub_mask + (uvhub/8)) & (1 << (uvhub%8))))
+ continue;
+ have_hmaster = 0;
bdp = &uvhub_descs[uvhub];
socket_mask = bdp->socket_mask;
socket = 0;
@@ -1551,8 +1553,10 @@ static void uv_init_per_cpu(int nuvhubs)
bcp->cpu = cpu;
if (i == 0) {
smaster = bcp;
- if (socket == 0)
+ if (!have_hmaster) {
+ have_hmaster++;
hmaster = bcp;
+ }
}
bcp->cpus_in_uvhub = bdp->num_cpus;
bcp->cpus_in_socket = sdp->num_cpus;
@@ -1566,11 +1570,9 @@ nextsocket:
socket++;
socket_mask = (socket_mask >> 1);
}
-nexthub:
- uvhub++;
- uvhub_mask = (uvhub_mask >> 1);
}
kfree(uvhub_descs);
+ kfree(uvhub_mask);
for_each_present_cpu(cpu) {
bcp = &per_cpu(bau_control, cpu);
bcp->baudisabled = 0;
--
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