powerpc: Drop zalloc_maybe_bootmem()

The only callers of zalloc_maybe_bootmem() are PCI setup routines. These
used to be called early during boot before slab setup, and also during
runtime due to hotplug.

But commit 5537fcb3 ("powerpc/pci: Add ppc_md.discover_phbs()")
moved the boot-time calls later, after slab setup, meaning there's no
longer any need for zalloc_maybe_bootmem(), kzalloc() can be used in all
cases.
Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20230823055430.752550-1-mpe@ellerman.id.au

arch/powerpc/include/asm/setup.h

@@ -8,7 +8,6 @@
 extern void ppc_printk_progress(char *s, unsigned short hex);
 
 extern unsigned long long memory_limit;
-extern void *zalloc_maybe_bootmem(size_t size, gfp_t mask);
 
 struct device_node;
 

arch/powerpc/kernel/pci-common.c

@@ -125,7 +125,7 @@ struct pci_controller *pcibios_alloc_controller(struct device_node *dev)
 {
 	struct pci_controller *phb;
 
-	phb = zalloc_maybe_bootmem(sizeof(struct pci_controller), GFP_KERNEL);
+	phb = kzalloc(sizeof(struct pci_controller), GFP_KERNEL);
 	if (phb == NULL)
 		return NULL;
 

arch/powerpc/lib/Makefile

@@ -27,7 +27,7 @@ endif
 CFLAGS_code-patching.o += $(DISABLE_LATENT_ENTROPY_PLUGIN)
 CFLAGS_feature-fixups.o += $(DISABLE_LATENT_ENTROPY_PLUGIN)
 
-obj-y += alloc.o code-patching.o feature-fixups.o pmem.o
+obj-y += code-patching.o feature-fixups.o pmem.o
 
 obj-$(CONFIG_CODE_PATCHING_SELFTEST) += test-code-patching.o
 

arch/powerpc/lib/alloc.c

-// SPDX-License-Identifier: GPL-2.0
-#include <linux/types.h>
-#include <linux/init.h>
-#include <linux/slab.h>
-#include <linux/memblock.h>
-#include <linux/string.h>
-#include <asm/setup.h>
-
-
-void * __ref zalloc_maybe_bootmem(size_t size, gfp_t mask)
-{
-	void *p;
-
-	if (slab_is_available())
-		p = kzalloc(size, mask);
-	else {
-		p = memblock_alloc(size, SMP_CACHE_BYTES);
-		if (!p)
-			panic("%s: Failed to allocate %zu bytes\n", __func__,
-			      size);
-	}
-	return p;
-}

arch/powerpc/sysdev/fsl_pci.c

@@ -767,7 +767,7 @@ static int __init mpc83xx_pcie_setup(struct pci_controller *hose,
 	u32 cfg_bar;
 	int ret = -ENOMEM;
 
-	pcie = zalloc_maybe_bootmem(sizeof(*pcie), GFP_KERNEL);
+	pcie = kzalloc(sizeof(*pcie), GFP_KERNEL);
 	if (!pcie)
 		return ret;