kernel: delete Linux 5.4 config and patches

As the upcoming release will be based on Linux 5.10 only, remove all
kernel configuration as well as patches for Linux 5.4.
There were no targets still actively using Linux 5.4.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
(cherry picked from commit 3a14580411adfb75f9a44eded9f41245b9e44606)

1 files changed, 0 insertions, 120 deletions

diff --git a/target/linux/generic/backport-5.4/071-v5.16-04-mips-bpf-Add-JIT-workarounds-for-CPU-errata.patch b/target/linux/generic/backport-5.4/071-v5.16-04-mips-bpf-Add-JIT-workarounds-for-CPU-errata.patch
deleted file mode 100644
index 63553ebe58..0000000000
--- a/target/linux/generic/backport-5.4/071-v5.16-04-mips-bpf-Add-JIT-workarounds-for-CPU-errata.patch
+++ /dev/null
@@ -1,120 +0,0 @@
-From: Johan Almbladh <johan.almbladh@anyfinetworks.com>
-Date: Tue, 5 Oct 2021 18:54:06 +0200
-Subject: [PATCH] mips: bpf: Add JIT workarounds for CPU errata
-
-This patch adds workarounds for the following CPU errata to the MIPS
-eBPF JIT, if enabled in the kernel configuration.
-
-  - R10000 ll/sc weak ordering
-  - Loongson-3 ll/sc weak ordering
-  - Loongson-2F jump hang
-
-The Loongson-2F nop errata is implemented in uasm, which the JIT uses,
-so no additional mitigations are needed for that.
-
-Signed-off-by: Johan Almbladh <johan.almbladh@anyfinetworks.com>
-Reviewed-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
----
-
---- a/arch/mips/net/bpf_jit_comp.c
-+++ b/arch/mips/net/bpf_jit_comp.c
-@@ -404,6 +404,7 @@ void emit_alu_r(struct jit_context *ctx,
- /* Atomic read-modify-write (32-bit) */
- void emit_atomic_r(struct jit_context *ctx, u8 dst, u8 src, s16 off, u8 code)
- {
-+	LLSC_sync(ctx);
- 	emit(ctx, ll, MIPS_R_T9, off, dst);
- 	switch (code) {
- 	case BPF_ADD:
-@@ -420,18 +421,19 @@ void emit_atomic_r(struct jit_context *c
- 		break;
- 	}
- 	emit(ctx, sc, MIPS_R_T8, off, dst);
--	emit(ctx, beqz, MIPS_R_T8, -16);
-+	emit(ctx, LLSC_beqz, MIPS_R_T8, -16 - LLSC_offset);
- 	emit(ctx, nop); /* Delay slot */
- }
- 
- /* Atomic compare-and-exchange (32-bit) */
- void emit_cmpxchg_r(struct jit_context *ctx, u8 dst, u8 src, u8 res, s16 off)
- {
-+	LLSC_sync(ctx);
- 	emit(ctx, ll, MIPS_R_T9, off, dst);
- 	emit(ctx, bne, MIPS_R_T9, res, 12);
- 	emit(ctx, move, MIPS_R_T8, src);     /* Delay slot */
- 	emit(ctx, sc, MIPS_R_T8, off, dst);
--	emit(ctx, beqz, MIPS_R_T8, -20);
-+	emit(ctx, LLSC_beqz, MIPS_R_T8, -20 - LLSC_offset);
- 	emit(ctx, move, res, MIPS_R_T9);     /* Delay slot */
- 	clobber_reg(ctx, res);
- }
---- a/arch/mips/net/bpf_jit_comp.h
-+++ b/arch/mips/net/bpf_jit_comp.h
-@@ -87,7 +87,7 @@ struct jit_context {
- };
- 
- /* Emit the instruction if the JIT memory space has been allocated */
--#define emit(ctx, func, ...)					\
-+#define __emit(ctx, func, ...)					\
- do {								\
- 	if ((ctx)->target != NULL) {				\
- 		u32 *p = &(ctx)->target[ctx->jit_index];	\
-@@ -95,6 +95,30 @@ do {								\
- 	}							\
- 	(ctx)->jit_index++;					\
- } while (0)
-+#define emit(...) __emit(__VA_ARGS__)
-+
-+/* Workaround for R10000 ll/sc errata */
-+#ifdef CONFIG_WAR_R10000
-+#define LLSC_beqz	beqzl
-+#else
-+#define LLSC_beqz	beqz
-+#endif
-+
-+/* Workaround for Loongson-3 ll/sc errata */
-+#ifdef CONFIG_CPU_LOONGSON3_WORKAROUNDS
-+#define LLSC_sync(ctx)	emit(ctx, sync, 0)
-+#define LLSC_offset	4
-+#else
-+#define LLSC_sync(ctx)
-+#define LLSC_offset	0
-+#endif
-+
-+/* Workaround for Loongson-2F jump errata */
-+#ifdef CONFIG_CPU_JUMP_WORKAROUNDS
-+#define JALR_MASK	0xffffffffcfffffffULL
-+#else
-+#define JALR_MASK	(~0ULL)
-+#endif
- 
- /*
-  * Mark a BPF register as accessed, it needs to be
---- a/arch/mips/net/bpf_jit_comp64.c
-+++ b/arch/mips/net/bpf_jit_comp64.c
-@@ -375,6 +375,7 @@ static void emit_atomic_r64(struct jit_c
- 	u8 t1 = MIPS_R_T6;
- 	u8 t2 = MIPS_R_T7;
- 
-+	LLSC_sync(ctx);
- 	emit(ctx, lld, t1, off, dst);
- 	switch (code) {
- 	case BPF_ADD:
-@@ -391,7 +392,7 @@ static void emit_atomic_r64(struct jit_c
- 		break;
- 	}
- 	emit(ctx, scd, t2, off, dst);
--	emit(ctx, beqz, t2, -16);
-+	emit(ctx, LLSC_beqz, t2, -16 - LLSC_offset);
- 	emit(ctx, nop); /* Delay slot */
- }
- 
-@@ -414,7 +415,7 @@ static int emit_call(struct jit_context
- 	push_regs(ctx, ctx->clobbered & JIT_CALLER_REGS, 0, 0);
- 
- 	/* Emit function call */
--	emit_mov_i64(ctx, tmp, addr);
-+	emit_mov_i64(ctx, tmp, addr & JALR_MASK);
- 	emit(ctx, jalr, MIPS_R_RA, tmp);
- 	emit(ctx, nop); /* Delay slot */
-