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Subject[RFC][PATCH v2 1/7] switch dereference_function_descriptor() to `unsigned long'
Date
Convert dereference_function_descriptor() to accept and return
`unsigned long'. There will be two new ARCH function for kernel
and module function pointer dereference, which will work with
`unsigned long', so the patch unifies interfaces.

Besides, dereference_function_descriptor() mostly work with
`unsigned long':

drivers/misc/kgdbts.c:
addr = (unsigned long) dereference_function_descriptor((void *)addr);

init/main.c:
addr = (unsigned long) dereference_function_descriptor(fn);

kernel/extable.c:
addr = (unsigned long) dereference_function_descriptor(ptr);

kernel/module.c:
unsigned long a = (unsigned long)dereference_function_descriptor(addr);

Convert dereference_function_descriptor() users tree-wide.

Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
---
arch/ia64/include/asm/sections.h | 6 +++---
arch/parisc/include/asm/sections.h | 2 +-
arch/parisc/kernel/process.c | 6 +++---
arch/parisc/mm/init.c | 4 ++--
arch/powerpc/include/asm/sections.h | 6 +++---
drivers/misc/kgdbts.c | 2 +-
init/main.c | 2 +-
kernel/extable.c | 2 +-
kernel/module.c | 2 +-
lib/vsprintf.c | 2 +-
10 files changed, 17 insertions(+), 17 deletions(-)

diff --git a/arch/ia64/include/asm/sections.h b/arch/ia64/include/asm/sections.h
index 2ab2003698ef..de6bfa1ef8fb 100644
--- a/arch/ia64/include/asm/sections.h
+++ b/arch/ia64/include/asm/sections.h
@@ -27,13 +27,13 @@ extern char __start_unwind[], __end_unwind[];
extern char __start_ivt_text[], __end_ivt_text[];

#undef dereference_function_descriptor
-static inline void *dereference_function_descriptor(void *ptr)
+static inline unsigned long dereference_function_descriptor(unsigned long ptr)
{
- struct fdesc *desc = ptr;
+ struct fdesc *desc = (struct fdesc *)ptr;
void *p;

if (!probe_kernel_address(&desc->ip, p))
- ptr = p;
+ ptr = (unsigned long)p;
return ptr;
}

diff --git a/arch/parisc/include/asm/sections.h b/arch/parisc/include/asm/sections.h
index 9d13c3507ad6..59fbe0067112 100644
--- a/arch/parisc/include/asm/sections.h
+++ b/arch/parisc/include/asm/sections.h
@@ -6,7 +6,7 @@

#ifdef CONFIG_64BIT
#undef dereference_function_descriptor
-void *dereference_function_descriptor(void *);
+unsigned long dereference_function_descriptor(unsigned long);
#endif

#endif
diff --git a/arch/parisc/kernel/process.c b/arch/parisc/kernel/process.c
index a45a67d526f8..f00a5f93492a 100644
--- a/arch/parisc/kernel/process.c
+++ b/arch/parisc/kernel/process.c
@@ -267,13 +267,13 @@ get_wchan(struct task_struct *p)
}

#ifdef CONFIG_64BIT
-void *dereference_function_descriptor(void *ptr)
+unsigned long dereference_function_descriptor(unsigned long ptr)
{
- Elf64_Fdesc *desc = ptr;
+ Elf64_Fdesc *desc = (Elf64_Fdesc *)ptr;
void *p;

if (!probe_kernel_address(&desc->addr, p))
- ptr = p;
+ ptr = (unsigned long)p;
return ptr;
}
#endif
diff --git a/arch/parisc/mm/init.c b/arch/parisc/mm/init.c
index 1ca9a2b4239f..06e1b79e2946 100644
--- a/arch/parisc/mm/init.c
+++ b/arch/parisc/mm/init.c
@@ -389,10 +389,10 @@ static void __init setup_bootmem(void)
static int __init parisc_text_address(unsigned long vaddr)
{
static unsigned long head_ptr __initdata;
+ unsigned long addr = (unsigned long)&parisc_kernel_start;

if (!head_ptr)
- head_ptr = PAGE_MASK & (unsigned long)
- dereference_function_descriptor(&parisc_kernel_start);
+ head_ptr = PAGE_MASK & dereference_function_descriptor(addr);

return core_kernel_text(vaddr) || vaddr == head_ptr;
}
diff --git a/arch/powerpc/include/asm/sections.h b/arch/powerpc/include/asm/sections.h
index 7902d6358854..67379b8945e8 100644
--- a/arch/powerpc/include/asm/sections.h
+++ b/arch/powerpc/include/asm/sections.h
@@ -66,13 +66,13 @@ static inline int overlaps_kvm_tmp(unsigned long start, unsigned long end)

#ifdef PPC64_ELF_ABI_v1
#undef dereference_function_descriptor
-static inline void *dereference_function_descriptor(void *ptr)
+static inline unsigned long dereference_function_descriptor(unsigned long ptr)
{
- struct ppc64_opd_entry *desc = ptr;
+ struct ppc64_opd_entry *desc = (struct ppc64_opd_entry *)ptr;
void *p;

if (!probe_kernel_address(&desc->funcaddr, p))
- ptr = p;
+ ptr = (unsigned long)p;
return ptr;
}
#endif /* PPC64_ELF_ABI_v1 */
diff --git a/drivers/misc/kgdbts.c b/drivers/misc/kgdbts.c
index fc7efedbc4be..6a5a159dfb75 100644
--- a/drivers/misc/kgdbts.c
+++ b/drivers/misc/kgdbts.c
@@ -225,7 +225,7 @@ static unsigned long lookup_addr(char *arg)
addr = (unsigned long)_do_fork;
else if (!strcmp(arg, "hw_break_val"))
addr = (unsigned long)&hw_break_val;
- addr = (unsigned long) dereference_function_descriptor((void *)addr);
+ addr = dereference_function_descriptor(addr);
return addr;
}

diff --git a/init/main.c b/init/main.c
index 0ee9c6866ada..396b0bda696e 100644
--- a/init/main.c
+++ b/init/main.c
@@ -761,7 +761,7 @@ static bool __init_or_module initcall_blacklisted(initcall_t fn)
if (list_empty(&blacklisted_initcalls))
return false;

- addr = (unsigned long) dereference_function_descriptor(fn);
+ addr = dereference_function_descriptor((unsigned long)fn);
sprint_symbol_no_offset(fn_name, addr);

/*
diff --git a/kernel/extable.c b/kernel/extable.c
index 38c2412401a1..ca4c34d1d5a4 100644
--- a/kernel/extable.c
+++ b/kernel/extable.c
@@ -150,7 +150,7 @@ int kernel_text_address(unsigned long addr)
int func_ptr_is_kernel_text(void *ptr)
{
unsigned long addr;
- addr = (unsigned long) dereference_function_descriptor(ptr);
+ addr = dereference_function_descriptor((unsigned long)ptr);
if (core_kernel_text(addr))
return 1;
return is_module_text_address(addr);
diff --git a/kernel/module.c b/kernel/module.c
index de66ec825992..ea77ab13bead 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -1067,7 +1067,7 @@ EXPORT_SYMBOL(__symbol_put);
void symbol_put_addr(void *addr)
{
struct module *modaddr;
- unsigned long a = (unsigned long)dereference_function_descriptor(addr);
+ unsigned long a = dereference_function_descriptor((unsigned long)addr);

if (core_kernel_text(a))
return;
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 86c3385b9eb3..bcd906a39010 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -1723,7 +1723,7 @@ char *pointer(const char *fmt, char *buf, char *end, void *ptr,
switch (*fmt) {
case 'F':
case 'f':
- ptr = dereference_function_descriptor(ptr);
+ ptr = (void *)dereference_function_descriptor((unsigned long)ptr);
/* Fallthrough */
case 'S':
case 's':
--
2.14.1
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