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Subject[GIT PULL v2] 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: 06c8173eb92bbfc03a0fe8bb64315857d0badd06 x86/fpu/xsaves: Fix improper uses of __ex_table

Misc fixes: EFI fixes, an Intel Quark fix, an asm fix and an FPU handling fix.

out-of-topic modifications in x86-urgent-for-linus:
-----------------------------------------------------
drivers/firmware/dmi_scan.c # 6d9ff4733172: firmware: dmi_scan: Fix dmi_
# ce204e9a4bd8: firmware: dmi_scan: Fix dmi
drivers/firmware/efi/libstub/efi-stub-helper.c# 7ed620bb343f: efi/libstub: Fix boundary ch

Thanks,

Ingo

------------------>
Andy Lutomirski (1):
x86/asm/entry/64: Remove a bogus 'ret_from_fork' optimization

Andy Shevchenko (1):
x86/intel/quark: Select COMMON_CLK

Ivan Khoronzhuk (2):
firmware: dmi_scan: Fix dmi scan to handle "End of Table" structure
firmware: dmi_scan: Fix dmi_len type

Quentin Casasnovas (1):
x86/fpu/xsaves: Fix improper uses of __ex_table

Yinghai Lu (1):
efi/libstub: Fix boundary checking in efi_high_alloc()


arch/x86/Kconfig | 1 +
arch/x86/include/asm/xsave.h | 28 ++++++++++----------------
arch/x86/kernel/entry_64.S | 13 +++++++-----
drivers/firmware/dmi_scan.c | 17 ++++++++--------
drivers/firmware/efi/libstub/efi-stub-helper.c | 8 ++++----
5 files changed, 33 insertions(+), 34 deletions(-)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index c2fb8a87dccb..b7d31ca55187 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -499,6 +499,7 @@ config X86_INTEL_QUARK
depends on X86_IO_APIC
select IOSF_MBI
select INTEL_IMR
+ select COMMON_CLK
---help---
Select to include support for Quark X1000 SoC.
Say Y here if you have a Quark based system such as the Arduino
diff --git a/arch/x86/include/asm/xsave.h b/arch/x86/include/asm/xsave.h
index 5fa9770035dc..c9a6d68b8d62 100644
--- a/arch/x86/include/asm/xsave.h
+++ b/arch/x86/include/asm/xsave.h
@@ -82,18 +82,15 @@ static inline int xsave_state_booting(struct xsave_struct *fx, u64 mask)
if (boot_cpu_has(X86_FEATURE_XSAVES))
asm volatile("1:"XSAVES"\n\t"
"2:\n\t"
- : : "D" (fx), "m" (*fx), "a" (lmask), "d" (hmask)
+ xstate_fault
+ : "D" (fx), "m" (*fx), "a" (lmask), "d" (hmask)
: "memory");
else
asm volatile("1:"XSAVE"\n\t"
"2:\n\t"
- : : "D" (fx), "m" (*fx), "a" (lmask), "d" (hmask)
+ xstate_fault
+ : "D" (fx), "m" (*fx), "a" (lmask), "d" (hmask)
: "memory");
-
- asm volatile(xstate_fault
- : "0" (0)
- : "memory");
-
return err;
}

@@ -112,18 +109,15 @@ static inline int xrstor_state_booting(struct xsave_struct *fx, u64 mask)
if (boot_cpu_has(X86_FEATURE_XSAVES))
asm volatile("1:"XRSTORS"\n\t"
"2:\n\t"
- : : "D" (fx), "m" (*fx), "a" (lmask), "d" (hmask)
+ xstate_fault
+ : "D" (fx), "m" (*fx), "a" (lmask), "d" (hmask)
: "memory");
else
asm volatile("1:"XRSTOR"\n\t"
"2:\n\t"
- : : "D" (fx), "m" (*fx), "a" (lmask), "d" (hmask)
+ xstate_fault
+ : "D" (fx), "m" (*fx), "a" (lmask), "d" (hmask)
: "memory");
-
- asm volatile(xstate_fault
- : "0" (0)
- : "memory");
-
return err;
}

@@ -149,9 +143,9 @@ static inline int xsave_state(struct xsave_struct *fx, u64 mask)
*/
alternative_input_2(
"1:"XSAVE,
- "1:"XSAVEOPT,
+ XSAVEOPT,
X86_FEATURE_XSAVEOPT,
- "1:"XSAVES,
+ XSAVES,
X86_FEATURE_XSAVES,
[fx] "D" (fx), "a" (lmask), "d" (hmask) :
"memory");
@@ -178,7 +172,7 @@ static inline int xrstor_state(struct xsave_struct *fx, u64 mask)
*/
alternative_input(
"1: " XRSTOR,
- "1: " XRSTORS,
+ XRSTORS,
X86_FEATURE_XSAVES,
"D" (fx), "m" (*fx), "a" (lmask), "d" (hmask)
: "memory");
diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
index 10074ad9ebf8..1d74d161687c 100644
--- a/arch/x86/kernel/entry_64.S
+++ b/arch/x86/kernel/entry_64.S
@@ -269,11 +269,14 @@ ENTRY(ret_from_fork)
testl $3, CS-ARGOFFSET(%rsp) # from kernel_thread?
jz 1f

- testl $_TIF_IA32, TI_flags(%rcx) # 32-bit compat task needs IRET
- jnz int_ret_from_sys_call
-
- RESTORE_TOP_OF_STACK %rdi, -ARGOFFSET
- jmp ret_from_sys_call # go to the SYSRET fastpath
+ /*
+ * By the time we get here, we have no idea whether our pt_regs,
+ * ti flags, and ti status came from the 64-bit SYSCALL fast path,
+ * the slow path, or one of the ia32entry paths.
+ * Use int_ret_from_sys_call to return, since it can safely handle
+ * all of the above.
+ */
+ jmp int_ret_from_sys_call

1:
subq $REST_SKIP, %rsp # leave space for volatiles
diff --git a/drivers/firmware/dmi_scan.c b/drivers/firmware/dmi_scan.c
index c5f7b4e9eb6c..69fac068669f 100644
--- a/drivers/firmware/dmi_scan.c
+++ b/drivers/firmware/dmi_scan.c
@@ -78,7 +78,7 @@ static const char * __init dmi_string(const struct dmi_header *dm, u8 s)
* We have to be cautious here. We have seen BIOSes with DMI pointers
* pointing to completely the wrong place for example
*/
-static void dmi_table(u8 *buf, int len, int num,
+static void dmi_table(u8 *buf, u32 len, int num,
void (*decode)(const struct dmi_header *, void *),
void *private_data)
{
@@ -93,12 +93,6 @@ static void dmi_table(u8 *buf, int len, int num,
const struct dmi_header *dm = (const struct dmi_header *)data;

/*
- * 7.45 End-of-Table (Type 127) [SMBIOS reference spec v3.0.0]
- */
- if (dm->type == DMI_ENTRY_END_OF_TABLE)
- break;
-
- /*
* We want to know the total length (formatted area and
* strings) before decoding to make sure we won't run off the
* table in dmi_decode or dmi_string
@@ -108,13 +102,20 @@ static void dmi_table(u8 *buf, int len, int num,
data++;
if (data - buf < len - 1)
decode(dm, private_data);
+
+ /*
+ * 7.45 End-of-Table (Type 127) [SMBIOS reference spec v3.0.0]
+ */
+ if (dm->type == DMI_ENTRY_END_OF_TABLE)
+ break;
+
data += 2;
i++;
}
}

static phys_addr_t dmi_base;
-static u16 dmi_len;
+static u32 dmi_len;
static u16 dmi_num;

static int __init dmi_walk_early(void (*decode)(const struct dmi_header *,
diff --git a/drivers/firmware/efi/libstub/efi-stub-helper.c b/drivers/firmware/efi/libstub/efi-stub-helper.c
index 2fe195002021..f07d4a67fa76 100644
--- a/drivers/firmware/efi/libstub/efi-stub-helper.c
+++ b/drivers/firmware/efi/libstub/efi-stub-helper.c
@@ -179,12 +179,12 @@ efi_status_t efi_high_alloc(efi_system_table_t *sys_table_arg,
start = desc->phys_addr;
end = start + desc->num_pages * (1UL << EFI_PAGE_SHIFT);

- if ((start + size) > end || (start + size) > max)
- continue;
-
- if (end - size > max)
+ if (end > max)
end = max;

+ if ((start + size) > end)
+ continue;
+
if (round_down(end - size, align) < start)
continue;


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