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s390 fixes for 5.9-rc3

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- Disable preemption trace in percpu macros since the lockdep code itself
   uses percpu variables now and it causes recursions.
 
 - Fix kernel space 4-level paging broken by recent vmem rework.
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Merge tag 's390-5.9-4' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux

Pull s390 fixes from Vasily Gorbik:

 - Disable preemption trace in percpu macros since the lockdep code
   itself uses percpu variables now and it causes recursions.

 - Fix kernel space 4-level paging broken by recent vmem rework.

* tag 's390-5.9-4' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
  s390/vmem: fix vmem_add_range for 4-level paging
  s390: don't trace preemption in percpu macros
This commit is contained in:
Linus Torvalds 2020-08-29 12:51:58 -07:00
commit 1b46b921b0
2 changed files with 15 additions and 14 deletions
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28
arch/s390/include/asm/percpu.h
View File

@ -29,7 +29,7 @@
typedef typeof(pcp) pcp_op_T__; \
pcp_op_T__ old__, new__, prev__; \
pcp_op_T__ *ptr__; \
preempt_disable(); \
preempt_disable_notrace(); \
ptr__ = raw_cpu_ptr(&(pcp)); \
prev__ = *ptr__; \
do { \
@ -37,7 +37,7 @@
new__ = old__ op (val); \
prev__ = cmpxchg(ptr__, old__, new__); \
} while (prev__ != old__); \
preempt_enable(); \
preempt_enable_notrace(); \
new__; \
})
@ -68,7 +68,7 @@
typedef typeof(pcp) pcp_op_T__; \
pcp_op_T__ val__ = (val); \
pcp_op_T__ old__, *ptr__; \
preempt_disable(); \
preempt_disable_notrace(); \
ptr__ = raw_cpu_ptr(&(pcp)); \
if (__builtin_constant_p(val__) && \
((szcast)val__ > -129) && ((szcast)val__ < 128)) { \
@ -84,7 +84,7 @@
: [val__] "d" (val__) \
: "cc"); \
} \
preempt_enable(); \
preempt_enable_notrace(); \
}
#define this_cpu_add_4(pcp, val) arch_this_cpu_add(pcp, val, "laa", "asi", int)
@ -95,14 +95,14 @@
typedef typeof(pcp) pcp_op_T__; \
pcp_op_T__ val__ = (val); \
pcp_op_T__ old__, *ptr__; \
preempt_disable(); \
preempt_disable_notrace(); \
ptr__ = raw_cpu_ptr(&(pcp)); \
asm volatile( \
op " %[old__],%[val__],%[ptr__]\n" \
: [old__] "=d" (old__), [ptr__] "+Q" (*ptr__) \
: [val__] "d" (val__) \
: "cc"); \
preempt_enable(); \
preempt_enable_notrace(); \
old__ + val__; \
})
@ -114,14 +114,14 @@
typedef typeof(pcp) pcp_op_T__; \
pcp_op_T__ val__ = (val); \
pcp_op_T__ old__, *ptr__; \
preempt_disable(); \
preempt_disable_notrace(); \
ptr__ = raw_cpu_ptr(&(pcp)); \
asm volatile( \
op " %[old__],%[val__],%[ptr__]\n" \
: [old__] "=d" (old__), [ptr__] "+Q" (*ptr__) \
: [val__] "d" (val__) \
: "cc"); \
preempt_enable(); \
preempt_enable_notrace(); \
}
#define this_cpu_and_4(pcp, val) arch_this_cpu_to_op(pcp, val, "lan")
@ -136,10 +136,10 @@
typedef typeof(pcp) pcp_op_T__; \
pcp_op_T__ ret__; \
pcp_op_T__ *ptr__; \
preempt_disable(); \
preempt_disable_notrace(); \
ptr__ = raw_cpu_ptr(&(pcp)); \
ret__ = cmpxchg(ptr__, oval, nval); \
preempt_enable(); \
preempt_enable_notrace(); \
ret__; \
})
@ -152,10 +152,10 @@
({ \
typeof(pcp) *ptr__; \
typeof(pcp) ret__; \
preempt_disable(); \
preempt_disable_notrace(); \
ptr__ = raw_cpu_ptr(&(pcp)); \
ret__ = xchg(ptr__, nval); \
preempt_enable(); \
preempt_enable_notrace(); \
ret__; \
})
@ -171,11 +171,11 @@
typeof(pcp1) *p1__; \
typeof(pcp2) *p2__; \
int ret__; \
preempt_disable(); \
preempt_disable_notrace(); \
p1__ = raw_cpu_ptr(&(pcp1)); \
p2__ = raw_cpu_ptr(&(pcp2)); \
ret__ = __cmpxchg_double(p1__, p2__, o1__, o2__, n1__, n2__); \
preempt_enable(); \
preempt_enable_notrace(); \
ret__; \
})

1
arch/s390/mm/vmem.c
View File

@ -402,6 +402,7 @@ static int modify_p4d_table(pgd_t *pgd, unsigned long addr, unsigned long end,
pud = vmem_crst_alloc(_REGION3_ENTRY_EMPTY);
if (!pud)
goto out;
p4d_populate(&init_mm, p4d, pud);
}
ret = modify_pud_table(p4d, addr, next, add, direct);
if (ret)