RISC-V Fixes for 5.8-rc3

This contains a handful of fixes I'd like to target for rc3.  Most of them fix
 issues with the conversion of our vDSO to C.  There is also one fix to the
 SiFive PRCI driver that I picked up as it's causing boot issues on the
 hardware.
 
 * A fix to allow kernels with dynamic ftrace to use the vDSO.
 * Some build fixes for the C vDSO functions.
 * A fix to the PRCI driver's memory allocation, which was the cause of some
   boot panics with FREELIST_RANDOM.
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Merge tag 'riscv-for-linus-5.8-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux

Pull RISC-V fixes from Palmer Dabbelt:
 "This contains a handful of fixes I'd like to target for rc3.

  Most of them fix issues with the conversion of our vDSO to C. There is
  also one fix to the SiFive PRCI driver that I picked up as it's
  causing boot issues on the hardware.

   - A fix to allow kernels with dynamic ftrace to use the vDSO.

   - Some build fixes for the C vDSO functions.

   - A fix to the PRCI driver's memory allocation, which was the cause
     of some boot panics with FREELIST_RANDOM"

* tag 'riscv-for-linus-5.8-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux:
  riscv: Fixup __vdso_gettimeofday broke dynamic ftrace
  riscv: Add extern declarations for vDSO time-related functions
  clk: sifive: allocate sufficient memory for struct __prci_data
  riscv: Add -fPIC option to CFLAGS_vgettimeofday.o

arch/riscv/kernel/vdso/Makefile

@@ -17,7 +17,7 @@ vdso-syms += flush_icache
 obj-vdso = $(patsubst %, %.o, $(vdso-syms)) note.o
 
 ifneq ($(c-gettimeofday-y),)
-  CFLAGS_vgettimeofday.o += -include $(c-gettimeofday-y)
+  CFLAGS_vgettimeofday.o += -fPIC -include $(c-gettimeofday-y)
 endif
 
 # Build rules
@@ -27,6 +27,9 @@ obj-vdso := $(addprefix $(obj)/, $(obj-vdso))
 obj-y += vdso.o vdso-syms.o
 CPPFLAGS_vdso.lds += -P -C -U$(ARCH)
 
+# Disable -pg to prevent insert call site
+CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) -Os
+
 # Disable gcov profiling for VDSO code
 GCOV_PROFILE := n
 

arch/riscv/kernel/vdso/vgettimeofday.c

@@ -9,16 +9,22 @@
 #include <linux/time.h>
 #include <linux/types.h>
 
+extern
+int __vdso_clock_gettime(clockid_t clock, struct __kernel_timespec *ts);
 int __vdso_clock_gettime(clockid_t clock, struct __kernel_timespec *ts)
 {
 	return __cvdso_clock_gettime(clock, ts);
 }
 
+extern
+int __vdso_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *tz);
 int __vdso_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *tz)
 {
 	return __cvdso_gettimeofday(tv, tz);
 }
 
+extern
+int __vdso_clock_getres(clockid_t clock_id, struct __kernel_timespec *res);
 int __vdso_clock_getres(clockid_t clock_id, struct __kernel_timespec *res)
 {
 	return __cvdso_clock_getres(clock_id, res);

drivers/clk/sifive/fu540-prci.c

@@ -586,7 +586,10 @@ static int sifive_fu540_prci_probe(struct platform_device *pdev)
 	struct __prci_data *pd;
 	int r;
 
-	pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
+	pd = devm_kzalloc(dev,
+			  struct_size(pd, hw_clks.hws,
+				      ARRAY_SIZE(__prci_init_clocks)),
+			  GFP_KERNEL);
 	if (!pd)
 		return -ENOMEM;