powerpc: Finalise cleanup around ABI use

Now that we have CONFIG_PPC64_ELF_ABI_V1 and CONFIG_PPC64_ELF_ABI_V2,
get rid of all indirect detection of ABI version.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/709d9d69523c14c8a9fba4486395dca0f2d675b1.1652074503.git.christophe.leroy@csgroup.eu

arch/powerpc/Kconfig

@@ -208,7 +208,7 @@ config PPC
 	select HAVE_EFFICIENT_UNALIGNED_ACCESS	if !(CPU_LITTLE_ENDIAN && POWER7_CPU)
 	select HAVE_FAST_GUP
 	select HAVE_FTRACE_MCOUNT_RECORD
-	select HAVE_FUNCTION_DESCRIPTORS	if PPC64 && !CPU_LITTLE_ENDIAN
+	select HAVE_FUNCTION_DESCRIPTORS	if PPC64_ELF_ABI_V1
 	select HAVE_FUNCTION_ERROR_INJECTION
 	select HAVE_FUNCTION_GRAPH_TRACER
 	select HAVE_FUNCTION_TRACER

arch/powerpc/Makefile

@@ -213,7 +213,7 @@ CHECKFLAGS	+= -m$(BITS) -D__powerpc__ -D__powerpc$(BITS)__
 ifdef CONFIG_CPU_BIG_ENDIAN
 CHECKFLAGS	+= -D__BIG_ENDIAN__
 else
-CHECKFLAGS	+= -D__LITTLE_ENDIAN__ -D_CALL_ELF=2
+CHECKFLAGS	+= -D__LITTLE_ENDIAN__
 endif
 
 ifdef CONFIG_476FPE_ERR46

arch/powerpc/include/asm/types.h

@@ -11,14 +11,6 @@
 
 #include <uapi/asm/types.h>
 
-#ifdef __powerpc64__
-#if defined(_CALL_ELF) && _CALL_ELF == 2
-#define PPC64_ELF_ABI_v2 1
-#else
-#define PPC64_ELF_ABI_v1 1
-#endif
-#endif /* __powerpc64__ */
-
 #ifndef __ASSEMBLY__
 
 typedef __vector128 vector128;

arch/powerpc/kernel/fadump.c

@@ -978,11 +978,14 @@ static int fadump_init_elfcore_header(char *bufp)
 	elf->e_entry = 0;
 	elf->e_phoff = sizeof(struct elfhdr);
 	elf->e_shoff = 0;
-#if defined(_CALL_ELF)
-	elf->e_flags = _CALL_ELF;
-#else
-	elf->e_flags = 0;
-#endif
+
+	if (IS_ENABLED(CONFIG_PPC64_ELF_ABI_V2))
+		elf->e_flags = 2;
+	else if (IS_ENABLED(CONFIG_PPC64_ELF_ABI_V1))
+		elf->e_flags = 1;
+	else
+		elf->e_flags = 0;
+
 	elf->e_ehsize = sizeof(struct elfhdr);
 	elf->e_phentsize = sizeof(struct elf_phdr);
 	elf->e_phnum = 0;

arch/powerpc/kernel/ptrace/ptrace.c

@@ -444,10 +444,4 @@ void __init pt_regs_check(void)
 	 * real registers.
 	 */
 	BUILD_BUG_ON(PT_DSCR < sizeof(struct user_pt_regs) / sizeof(unsigned long));
-
-#ifdef CONFIG_PPC64_ELF_ABI_V1
-	BUILD_BUG_ON(!IS_ENABLED(CONFIG_HAVE_FUNCTION_DESCRIPTORS));
-#else
-	BUILD_BUG_ON(IS_ENABLED(CONFIG_HAVE_FUNCTION_DESCRIPTORS));
-#endif
 }

arch/powerpc/net/bpf_jit_comp64.c

@@ -126,7 +126,7 @@ void bpf_jit_build_prologue(u32 *image, struct codegen_context *ctx)
 {
 	int i;
 
-	if (__is_defined(CONFIG_PPC64_ELF_ABI_V2))
+	if (IS_ENABLED(CONFIG_PPC64_ELF_ABI_V2))
 		EMIT(PPC_RAW_LD(_R2, _R13, offsetof(struct paca_struct, kernel_toc)));
 
 	/*
@@ -266,7 +266,7 @@ static int bpf_jit_emit_tail_call(u32 *image, struct codegen_context *ctx, u32 o
 	int b2p_index = bpf_to_ppc(BPF_REG_3);
 	int bpf_tailcall_prologue_size = 8;
 
-	if (__is_defined(CONFIG_PPC64_ELF_ABI_V2))
+	if (IS_ENABLED(CONFIG_PPC64_ELF_ABI_V2))
 		bpf_tailcall_prologue_size += 4; /* skip past the toc load */
 
 	/*