Merge tag 'riscv-for-linus-7.2-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux

Pull RISC-V fixes from Paul Walmsley:

 - Fix a crash when a kretprobe reads from the stack

 - Fix an issue with the build-time mcount sorter that broke ftrace

 - Fix the rv32 IRQ stack frame padding to match the ABI

 - Only defer IOMMU configuration during initialization. This avoids an
   issue where IOMMU configuration could be indefinitely deferred

 - Add the missing build salt to the vDSO

 - Now that RISC-V systems with higher numbers of cores are starting to
   become available, raise NR_CPUS for RISC-V to 256

 - Clean up some warnings from sparse caused by the RISC-V-optimized
   RAID6 code

 - Clean up our __cpu_up() code with a few minor fixes

* tag 'riscv-for-linus-7.2-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux:
  riscv: probes: save original sp in rethook trampoline
  riscv: Fix 32-bit call_on_irq_stack() frame pointer ABI
  scripts/sorttable: Handle RISC-V patchable ftrace entries
  riscv: smp: use secs_to_jiffies in __cpu_up
  ACPI: RIMT: Only defer the IOMMU configuration in init stage
  riscv: Add build salt to the vDSO
  raid6: fix raid6_recov_rvv symbol undeclared warning
  raid6: fix riscv symbol undeclared warnigns
  riscv: Raise default NR_CPUS for 64BIT to 256

6 files changed, 16 insertions, 10 deletions

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 3f0a647218e4..c0a6992933e4 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -454,7 +454,8 @@ config NR_CPUS
 	range 2 32 if RISCV_SBI_V01 && 32BIT
 	range 2 64 if RISCV_SBI_V01 && 64BIT
 	default "32" if 32BIT
-	default "64" if 64BIT
+	default "64" if RISCV_SBI_V01 && 64BIT
+	default "256" if !RISCV_SBI_V01 && 64BIT
 
 config HOTPLUG_CPU
 	bool "Support for hot-pluggable CPUs"
diff --git a/arch/riscv/kernel/asm-offsets.c b/arch/riscv/kernel/asm-offsets.c
index af827448a609..a75f0cfea1e9 100644
--- a/arch/riscv/kernel/asm-offsets.c
+++ b/arch/riscv/kernel/asm-offsets.c
@@ -501,8 +501,8 @@ void asm_offsets(void)
 	OFFSET(SBI_HART_BOOT_STACK_PTR_OFFSET, sbi_hart_boot_data, stack_ptr);
 
 	DEFINE(STACKFRAME_SIZE_ON_STACK, ALIGN(sizeof(struct stackframe), STACK_ALIGN));
-	OFFSET(STACKFRAME_FP, stackframe, fp);
-	OFFSET(STACKFRAME_RA, stackframe, ra);
+	DEFINE(STACKFRAME_FP, offsetof(struct stackframe, fp) - sizeof(struct stackframe));
+	DEFINE(STACKFRAME_RA, offsetof(struct stackframe, ra) - sizeof(struct stackframe));
 #ifdef CONFIG_FUNCTION_TRACER
 	DEFINE(FTRACE_OPS_FUNC,		offsetof(struct ftrace_ops, func));
 #ifdef CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
diff --git a/arch/riscv/kernel/entry.S b/arch/riscv/kernel/entry.S
index c6988983cdf7..08df724e13b9 100644
--- a/arch/riscv/kernel/entry.S
+++ b/arch/riscv/kernel/entry.S
@@ -386,8 +386,8 @@ SYM_CODE_END(ret_from_fork_user_asm)
 SYM_FUNC_START(call_on_irq_stack)
 	/* Create a frame record to save ra and s0 (fp) */
 	addi	sp, sp, -STACKFRAME_SIZE_ON_STACK
-	REG_S	ra, STACKFRAME_RA(sp)
-	REG_S	s0, STACKFRAME_FP(sp)
+	REG_S	ra, (STACKFRAME_SIZE_ON_STACK + STACKFRAME_RA)(sp)
+	REG_S	s0, (STACKFRAME_SIZE_ON_STACK + STACKFRAME_FP)(sp)
 	addi	s0, sp, STACKFRAME_SIZE_ON_STACK
 
 	/* Switch to the per-CPU shadow call stack */
@@ -405,8 +405,8 @@ SYM_FUNC_START(call_on_irq_stack)
 
 	/* Switch back to the thread stack and restore ra and s0 */
 	addi	sp, s0, -STACKFRAME_SIZE_ON_STACK
-	REG_L	ra, STACKFRAME_RA(sp)
-	REG_L	s0, STACKFRAME_FP(sp)
+	REG_L	ra, (STACKFRAME_SIZE_ON_STACK + STACKFRAME_RA)(sp)
+	REG_L	s0, (STACKFRAME_SIZE_ON_STACK + STACKFRAME_FP)(sp)
 	addi	sp, sp, STACKFRAME_SIZE_ON_STACK
 
 	ret
diff --git a/arch/riscv/kernel/probes/rethook_trampoline.S b/arch/riscv/kernel/probes/rethook_trampoline.S
index f2cd83d9b0f0..c3aa8d8cf5af 100644
--- a/arch/riscv/kernel/probes/rethook_trampoline.S
+++ b/arch/riscv/kernel/probes/rethook_trampoline.S
@@ -41,6 +41,9 @@
 	REG_S x29, PT_T4(sp)
 	REG_S x30, PT_T5(sp)
 	REG_S x31, PT_T6(sp)
+	/* save original sp */
+	addi a0, sp, PT_SIZE_ON_STACK
+	REG_S a0, PT_SP(sp)
 	.endm
 
 	.macro restore_all_base_regs
diff --git a/arch/riscv/kernel/smpboot.c b/arch/riscv/kernel/smpboot.c
index 8b628580fe11..f6ef57930b50 100644
--- a/arch/riscv/kernel/smpboot.c
+++ b/arch/riscv/kernel/smpboot.c
@@ -189,13 +189,12 @@ int arch_cpuhp_kick_ap_alive(unsigned int cpu, struct task_struct *tidle)
 #else
 int __cpu_up(unsigned int cpu, struct task_struct *tidle)
 {
-	int ret = 0;
+	int ret;
 	tidle->thread_info.cpu = cpu;
 
 	ret = start_secondary_cpu(cpu, tidle);
 	if (!ret) {
-		wait_for_completion_timeout(&cpu_running,
-					    msecs_to_jiffies(1000));
+		wait_for_completion_timeout(&cpu_running, secs_to_jiffies(1));
 
 		if (!cpu_online(cpu)) {
 			pr_crit("CPU%u: failed to come online\n", cpu);
diff --git a/arch/riscv/kernel/vdso/note.S b/arch/riscv/kernel/vdso/note.S
index 3d92cc956b95..69bfe48be037 100644
--- a/arch/riscv/kernel/vdso/note.S
+++ b/arch/riscv/kernel/vdso/note.S
@@ -4,6 +4,7 @@
  * Here we can supply some information useful to userland.
  */
 
+#include <linux/build-salt.h>
 #include <linux/elfnote.h>
 #include <linux/version.h>
 #include <asm/assembler.h>
@@ -12,4 +13,6 @@ ELFNOTE_START(Linux, 0, "a")
 	.long LINUX_VERSION_CODE
 ELFNOTE_END
 
+BUILD_SALT
+
 emit_riscv_feature_1_and