Recent arm64 builds using CONFIG_ARM64_64K_PAGES are failing with:
arch/arm64/kernel/perf_regs.c: In function ‘perf_reg_abi’:
arch/arm64/kernel/perf_regs.c:41:2: error: implicit declaration of function
‘is_compat_thread’
arch/arm64/kernel/perf_event.c:1398:2: error: unknown type name
‘compat_uptr_t’
This is due to some recent arm64 perf commits with compat support:
commit 23c7d70d55c6d9:
ARM64: perf: add support for frame pointer unwinding in compat mode
commit 2ee0d7fd36a3f8:
ARM64: perf: add support for perf registers API
Those patches make the arm64 kernel unbuildable if CONFIG_COMPAT is not
defined and CONFIG_ARM64_64K_PAGES depends on !CONFIG_COMPAT. This patch
allows the arm64 kernel to build with and without CONFIG_COMPAT.
Signed-off-by: Mark Salter <msal...@redhat.com>
---
arch/arm64/kernel/perf_event.c | 4 ++++
arch/arm64/kernel/perf_regs.c | 2 ++
2 files changed, 6 insertions(+)
diff --git a/arch/arm64/kernel/perf_event.c b/arch/arm64/kernel/perf_event.c
index e868c72..baf5afb 100644
--- a/arch/arm64/kernel/perf_event.c
+++ b/arch/arm64/kernel/perf_event.c
@@ -1386,6 +1386,7 @@ user_backtrace(struct frame_tail __user *tail,
return buftail.fp;
}
+#ifdef CONFIG_COMPAT
/*
* The registers we're interested in are at the end of the variable
* length saved register structure. The fp points at the end of this
@@ -1430,6 +1431,7 @@ compat_user_backtrace(struct compat_frame_tail __user
*tail,
return (struct compat_frame_tail __user *)compat_ptr(buftail.fp) - 1;
}
+#endif /* CONFIG_COMPAT */
void perf_callchain_user(struct perf_callchain_entry *entry,
struct pt_regs *regs)
@@ -1451,6 +1453,7 @@ void perf_callchain_user(struct perf_callchain_entry
*entry,
tail && !((unsigned long)tail & 0xf))
tail = user_backtrace(tail, entry);
} else {
+#ifdef CONFIG_COMPAT
/* AARCH32 compat mode */
struct compat_frame_tail __user *tail;
@@ -1459,6 +1462,7 @@ void perf_callchain_user(struct perf_callchain_entry
*entry,
while ((entry->nr < PERF_MAX_STACK_DEPTH) &&
tail && !((unsigned long)tail & 0x3))
tail = compat_user_backtrace(tail, entry);
+#endif
}
}
diff --git a/arch/arm64/kernel/perf_regs.c b/arch/arm64/kernel/perf_regs.c
index f2d6f0a..422ebd6 100644
--- a/arch/arm64/kernel/perf_regs.c
+++ b/arch/arm64/kernel/perf_regs.c
@@ -2,6 +2,8 @@
#include <linux/kernel.h>
#include <linux/perf_event.h>
#include <linux/bug.h>
+
+#include <asm/compat.h>
#include <asm/perf_regs.h>
#include <asm/ptrace.h>
--
1.8.5.3
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